Harry sat back in his seat. What happened just now made him think that he was still asleep or that he had celebrated April Fool's Day in advance. But the twins and Wood had already surrounded him. They also saw Professor McGonagall's serious face and heard the arguments between them.

Although they didn't hear everything clearly, the occasional "Quidditch" and "training" were enough to scare them.

Harry explained the trouble he encountered. Although Wood looked unhappy, he still comforted him, "It's okay, come back before dark, we will continue training. Anyway, your original position is a free man, the impact is not big..."

He finally made a bad joke, "Black couldn't have been locked up for more than ten years and his eyesight was not good, so he mistook me for you?"

The twins laughed heartlessly. It was not easy to mistake the burly Wood for Harry.

But Harry was not in the mood to laugh. He really realized that Black, the fugitive who had been in prison for twelve years, was so close to him at one time.

"Perhaps, I should spend more time on the paper on the duel system." Harry touched his schoolbag, where the beginning of a paper was hidden.

Over the weekend, as Halloween approached, the festive atmosphere became stronger.

Felix got up early and reviewed the paper in his hand.

"…The above shows that we may have found a new treatment for memory damage, which will be more targeted than the old drugs and spells. The only problem is that we need to find a way to stably connect the patient's memory, not a short-term and malicious prying into the mind like Legilimency, but a way of information exchange in a cooperative state. At

the same time, for examples of extreme memory damage (large-scale permanent damage, memory fragmentation), simple bonding cannot cope with this situation. We need to consider making memory have a stable structure...'

Felix nodded with satisfaction, "The whole paper is a theoretical deduction, but it also implicitly mentions the most critical part - the magic of the mind hut and the structure of stable memory."

"Let's throw it out first to see the reaction. Well... I can publish it in the monthly magazine of the Daily Prophet. It will have a certain influence, but it is not professional and the brewing period is longer."

"I estimate that it will not spread among the therapist community until mid-to-late November. Such purely theoretical things will definitely attract different opinions. At that time, the situation of the Longbottom couple may not be concealed, but I can use this as an excuse to avoid the intervention of St. Mungo at a higher level. No one will be stupid enough to reject a potential result of the Order of Merlin."

He put away the paper. He only needed to adjust the wording and re-copy it before sending it out.

Felix sat on the sofa, thinking about how to simplify the treatment plan. This was also Dumbledore's advice to him. Whether it was the magic of the mind hut or the memory nodes inherited from Ms. Ravenclaw, they were extremely valuable knowledge. He was not so bold as to publish it casually.

Besides, few people can learn it.

"It's relatively easy to simplify the magic of the Mind House. I know it well. As for the memory nodes..." Felix thought about it and decided to throw out the stable memory structure that he understood from the inheritance of Ms. Ravenclaw. He used this structure on the magic puppets, which can make them have relatively stable personalities and habits, and even rehearse dramas on their own.

In the glass container on the workbench, the eight-eyed giant spider urged hoarsely: "Hurry up, hurry up! I can't wait."

Felix turned his head: "Really not considering it anymore? I can give you a vacation, and there is plenty of food..."

"Don't say it, don't say it!" The eight-eyed giant spider said irritably, "Let me go back."

"Okay." Felix stretched out his hand and grabbed it. The glass container on the workbench flew into his hand and broke with a "click". In a hazy blue light, the size of the eight-eyed giant spider continued to shrink and soon became as big as the tip of the thumb.

Felix put it back into the small-mouthed glass bottle, and a small voice came from the bottle, "Your magic has improved again. I don't feel anything strange. Maybe, I mean maybe... occasionally cooperate with your test." Felix curled his lips and put the bottle into his pocket.

He looked at the time and appeared at the gate of the castle on time. Two minutes later, just when he thought he would not be able to wait for anyone, Luna appeared hopping.

"Felix, I prepared some peas mixed with butter. Firenze will like it." She pointed to the crookedly woven flower basket and said. Felix

didn't know the taste of centaurs, but he didn't like this smell very much, so he changed the subject and said, "Let's go and meet your friends."

They went down the slope, passing the greenhouse and the Whomping Willow. Hagrid's hut appeared in sight from afar, but they did not approach it, but turned a corner and went straight into the forbidden forest. Passing

through a barrier of trees, they soon came to an open space. The open space was covered with moss and various wild flowers, and several stones were carefully cleaned. Obviously, this was Luna's secret base.

Luna took out a whistle from her pocket and blew it with her cheeks puffed up. The sound was not loud and blended perfectly with the rustling sound of the wind around her. Felix judged that it was a magic item.

Soon, Felix heard the sound of horse hooves trotting, and a young centaur appeared. He had white hair and a body of a silver-maned horse.

Felix judged that he was "young" because of his human face. The centaur carefully looked at him through the branches and leaves of the tree, half of his body hidden behind the tree trunk.

"Little Luna, is he your teacher?" the centaur asked. Felix was wearing exquisite clothes, so he did not doubt Felix's identity as a professor.

"Yes, come on, I have prepared new food for you, let's try it together!" Luna said happily.

Firenze came out from behind the tree trunk and stopped two meters away from Felix. He had a stiff face, "Hello, I'm Firenze."

"Oh, hello, I'm Felix Hep." Felix said politely.

"Listen, wizard. We usually don't interact with people, especially adult wizards. If little Luna hadn't asked me to meet you..."

Felix smiled and said, "I know centaurs are xenophobic, but I think you will be an exception. And I came here to discuss some serious issues with you."

Firenze stared, "What are the issues?"

"Do you know Sirius Black?"

"I've heard of this name. He's a dangerous person." Firenze said casually.

"Yes, he escaped from Azkaban, and the Ministry of Magic and the Dementors were furious. By the way, have you seen Dementors?"

Firenze said stiffly, "I haven't, but some of my tribesmen said they have seen their shadows."

"That's it," Felix said, "The Forbidden Forest is not safe, and with all due respect, if the Dementors really get out of control, I don't think you will have any good way to fight them."

The centaur dug his hooves into the dirt, an angry look on his face, but he knew it was true.

Felix continued, "It's too dangerous to let a student get close to the Forbidden Forest, and it's against school rules. My opinion is that we should be cautious until the Dementors are gone."

"You want to stop us from meeting?"

"I have no intention of ruining a friendship. It may be a wonderful memory for Luna when she grows up. Firenze, you and Hagrid should know each other?"

"Yes," said the centaur.

Felix laughed. "Isn't that great? I think Hagrid won't mind hosting you. Perhaps, it would be nice to meet at the pumpkin patch behind Hagrid's hut."

Firenze said, "Hagrid may be stronger than the centaurs, but I don't think he can deal with the Dementors."

Felix shook his head. "Firenze, you still don't understand. Hagrid is a wizard. No matter how he usually behaves, he is undoubtedly a wizard. He has more means than you and your tribe combined."

"Maybe he can't fight the Dementors, but he can hold on for a short time until he gets support. What's more, we are discussing the most extreme situation. It is rare for Dementors to get out of control."

Firenze agreed reluctantly. He walked forward, bent down and shook hands with Felix.

"It can be seen that you have no prejudice against centaurs, Mr. Hep." He said.

"Oh, of course not, Firenze, do you know where the nest of the Acromantula is?" Felix asked.

"Yes," Firenze pointed in a direction hesitantly, "Their nest is to the west of the tribe. Many years ago, we had a fight. Their hunting range will not cross the border we set."

Felix roughly guessed the location of the centaurs' settlement, the spider's nest and Hogwarts. He suddenly found that the centaurs separated the group of giant spiders. Even if the young wizard was playful, it would be difficult to walk on the bumpy road for several hours, and it was very likely that he would be discovered by the centaurs and expelled back.

In the following time, except that Luna was in a good mood, Felix and Firenze did not talk much. Firenze and Luna shared "morning tea", which was the plate of butter peas. Luna also wanted Felix to try it, but he refused directly.

Before leaving, Firenze hesitated and said, "Maybe you are right."

"What?" Felix asked.

"Danger is approaching..." The centaur swung his silver tail uneasily, "The tribe has also observed that the undercurrent is surging and the darkness is approaching."

Felix laughed, "Maybe this indicates that a certain dark lord who has disappeared will appear again?"

Firenze stared at him in surprise and said slowly, "I didn't predict it so accurately. The centaur observed the stars and found some important revelations from them, but they only responded in a general way."

Felix said easily, "I can't predict, but I know more than the average person. When you have enough information, you can naturally see farther. This is also the principle of arithmetic divination."

Coming out of the forbidden forest, Luna said thoughtfully, "Are you discussing the mysterious man? Is he coming back?"

"That's possible." Felix didn't explain in detail. She was only in the second grade.

After sending Luna away, Felix turned back to the forbidden forest and walked in the direction pointed by the centaur for more than ten minutes. Later, he simply used a flying broom to quickly fly over from a low altitude.

His goal was clear, it was the nest of the eight-eyed giant spider.