The phoenix on Dumbledore's shoulder called out in response.

"Keep an eye on Harry, no need to show up." He said, Fawkes spread his wings and flew into the air, disappearing very abruptly.

"What a strange creature," Felix said in admiration, "It makes people want to get close to it."

Dumbledore glanced at him, "Hagrid is very happy recently. He told me that an old friend came to stay temporarily. Do you know why, Felix?"

Felix avoided the question, "I don't know either. The headmaster... I haven't been in touch recently."

Soon, the deans and professors of the four colleges came, and Professor McGonagall briefly explained the situation.

Snape was shocked, "Black! Still so stupid... How did he break through the Dementors' defense?"

Felix said faintly, "Severus, he can escape from Azkaban, so why does he care about a few Dementors? To me, this thing is disgusting and useless."

At present, the Dementors have not appeared in the school grounds. The only way for students to see the Dementors is to pass Hagrid's hut, walk down a long ramp, and see the two guarding the main entrance of the school.

But if you shrink Hogwarts to a certain scale, you will find that there are a large number of Dementors gathered on the edge of Hogwarts, including the wizarding village of Hogsmeade adjacent to the school.

This is why Felix thinks Luna's behavior is not safe. No one can guarantee that a Dementor will suddenly jump out. Although the Ministry of Magic will definitely set up patrol areas, young and emotional students are tantamount to a feast for Dementors.

This is also the reason why Dumbledore strongly opposes them entering the school. In his opinion, the Ministry of Magic cannot control Dementors at all. But he had to make certain compromises and allow them to appear outside the school.

Snape calmed down, and said to Dumbledore suggestively: "Principal Dumbledore, the newspaper said the day before yesterday that Black's traces were found in Diagon Alley, and today he appeared outside the castle. It seems to me that he can't do this without help."

The professors present looked at Snape in surprise, and Flitwick shouted sharply: "Are you saying that Black has summoned some Death Eaters?"

Snape was stunned for a moment, he didn't mean that...

The professors talked about it, and they almost instantly accepted Snape's idea, or rather, this was a reasonable guess.

The newspaper had already boasted that Black was "the first Death Eater under the mysterious man", and it would be strange if he couldn't find help with such a label.

"With his prestige..."

"Maybe that's the case. We thought Black was just one person, but maybe he has gathered a lot of dark wizards."

Lupin, who had been silent, suddenly spoke: "I don't think so, Sirius." He froze for a second or two, "Black is just an undercover. I think even in the Death Eater circle, his identity is unknown."

"Lupin, can I understand that you are defending your best friend?" Snape directed his spearhead at Lupin, and he deliberately emphasized the voice of the word "best friend".

"No, Snape." Lupin said calmly, "Just a simple analysis." He looked at Dumbledore, "Perhaps when he returns to the Death Eaters as an undercover agent, he will be warmly welcomed and sought after, but the problem is, he failed, and his information directly led to the disappearance of the mysterious man. Will there be any Death Eaters who believe him?"

"Principal, from what I know about him, Black is definitely alone, maybe... maybe to prove himself, just like he did when he was in school, or in every battle in the war years, he was at the forefront." Lupin concluded dejectedly: "He likes adventure and likes to be a lone hero."

Snape's eyes turned cold, but he didn't speak again. He shrank into the darkness of the corner without saying a word.

A professor put forward his own opinion: "But without the help of the Death Eaters, how could he travel hundreds of kilometers in two days? There are many people trying to track him down. The Ministry of Magic has invested a lot of money this time, and the reward is not low."

"There are too many possibilities, Floo powder, portkeys, broomsticks..."

"But they will leave traces, and Black definitely dare not expose himself!"

"Could it be Apparition? Some wizards don't even need a wand to use it."

Flitwick is an authority on spells, he rejected this speculation: "In theory, Apparition does not require a wand, but in reality few people can do it. It is much more difficult than you think, and accidents are very likely to happen. Moreover, Apparition also has many limitations, unless... unless he gets a wand!"

"How is that possible?"

"Steal, rob, as long as you see the opportunity, nothing is impossible."

Dumbledore interrupted the discussion, "Everyone, let's search the castle first to make sure there is no risk."

In the end, all the teachers spent most of the night until dawn, and did not find any problems.

The professors dispersed one after another, and Dumbledore, Professor McGonagall, Snape and Felix gathered together again. Professor McGonagall came to report the latest progress, and Snape obviously had something to say. Felix, on the other hand, had a small question that needed to be answered by Dumbledore. Professor

McGonagall said, "I have taken Black's portrait to the Fat Lady for confirmation, and she will never make a mistake."

"Very good, Minerva," said Dumbledore. "It's better to make all the portraits in the castle remember Black's appearance. I mean... those portraits that can communicate."

Professor McGonagall nodded, Snape snorted softly, and Dumbledore turned to look at him: "Severus, you look like you have something to say?"

There was no emotion in Snape's words: "Dumbledore, I think we are doing useless work. We discussed it before school started." He raised his head and looked down from his hooked nose, "As long as there are hidden dangers in the castle, Black will always find an opportunity."

Professor McGonagall said sternly: "Are you saying that someone in Hogwarts leaked the information? This is impossible! Impossible, Severus."

Dumbledore said firmly: "What happened today just proves that there is no helper of Black in the school."

"That's not necessarily true, Headmaster," Snape said quickly in a low voice, "Perhaps the mole just doesn't know that there is a looking glass specifically for Black. In fact," he showed a sarcastic expression, "I've been kept in the dark too, haven't I?"

Felix knew who he was talking about, Remus Lupin, Sirius Black's best friend at school. Snape had intentionally led everyone to suspect him a few hours ago, but was led astray by Flitwick...

It seemed that Dumbledore had warned him not to reveal Lupin's identity as a werewolf, otherwise the professors and parents of students would definitely be furious. During the war years, werewolves had been an important dark force of Voldemort.

...

When McGonagall and Snape left, Felix raised the question in his mind.

"You want to know how Dementors reproduce?" Dumbledore repeated the question he heard.

"Yes, as far as I know, there are not many Dementors, about a hundred? The information I came across when I was in school showed that their number has not changed much in the past hundred years." Felix asked.