Especially for this transcript, Bai Song even went out of his way to find this person to confirm it, and it was indeed him who saw the candle lit when he passed by.

This person is one of the supervisors at the construction site and is not a third party with any vested interest, so his testimony is still credible.

This is something Bai Song has always found difficult to understand. He kept lighting the candles, and then they exploded after a few minutes?

Did the hydrogen balloon really explode?

This is not absolutely impossible. For example, if Yao directly puts a hydrogen balloon on the fire, the hydrogen balloon will burst and cause combustion within a certain range. However, judging from the video surveillance, even if more than 20 balloons are burning at the same time, it will not reach this level.

"Do we need to do an investigative experiment?" Wang Liang asked.

"This is a bit dangerous, but it's not impossible," Bai Song said. "The degree of danger is still controllable, but what I have learned tells me that this amount of hydrogen is really not enough. From the video, I can see that my daughter brought a bunch of balloons. The balloons are soft and thin ropes, and they are still floating in the air, so there will be nothing inside except hydrogen. Even if there are methane, helium and other gases lighter than air mixed in, they are of no value."

"Well, those things are not as powerful as hydrogen explosions." Wang Liang thought for a while and said, "Then I can't understand it. Let's wait for Brother Jie. Maybe there is poison gas in the balloon."

"Well, wait a moment."

…

Half an hour later, news came from Sun Jie that no poisoning was found in the deceased's respiratory tract or blood, but the alcohol concentration was a little high.

In other words, the burns did cause the heart attack. But Sun Jie pointed out that the man was severely burned and could not be saved even if he did not have a heart attack.

"Brother Jie," Bai Song asked, "This man is definitely in a state of burns that cannot be seen, but if he was just drunk and ran out within half a minute after the initial panic, can he still be saved?"

"He can be saved. Although the temperature is extremely high at the beginning, if the time is short enough and someone pours water on him immediately after he goes out, then he can be saved." Sun Jie said.

"From the situation at the scene, everyone who lived near him went drinking with him. The slow firefighting yesterday had a lot to do with this. Otherwise, if everyone was sober, the fire wouldn't have dragged on until the firefighters arrived." Bai Song thought for a moment: "What if no one came to his rescue within three minutes after he came out, and the fire on his body couldn't be put out?"

"It can be saved, but it's very difficult," said Sun Jie.

"Okay, I understand." Bai Song said, "When can the final report be issued?"

"We need to get an autopsy, but we have to wait for the family's consent. His children have not agreed to the autopsy yet," Sun Jie said, "We are trying to find a way to do it."

"Article 129 of the Criminal Procedure Law states that if the cause of death is unknown, we have the right to decide on an autopsy. Why do we need their consent?" Bai Song said directly: "Although the work can be carried out more easily with the consent of the family members, in this case, we cannot rule out the possibility of murder by the family members. We have the right to directly perform an autopsy. Of course, we also have the obligation to notify the family members to be present."

"But..." Sun Jie hesitated.

"I said this," Bai Song said, "Until there is no objection from the Zhuang Branch and the higher-ups, you will listen to me on this case."

"Okay, I'll talk to the people here." Sun Jie wanted to say that he was not the chief forensic doctor in this case.

Bai Song finally understood what he meant. Sun Jie was not handling the case smoothly here.

Wang Liang and Liu Shuyuan are both deputy captains, and they are respected wherever they go. Sun Jie is just an ordinary criminal policeman, so it is normal that he is not taken seriously.

"I'll call their detachment leader." Bai Song said and dialed the number directly.

…

After arranging Sun Jie's affairs, Bai Song then contacted Wang Huadong and Liu Shuyuan.

The on-site handling was not adequate. After careful inspection, Wang Huadong found a portion of the burned polymer compound in the window gap.

Because the weather is cold, the house is well sealed, and there are sealing strips on the doors, but there are still gaps in the windows. This is an ordinary sliding aluminum alloy window. Although there are plastic sealing strips and waterproof strips, something was still found between the two windows.

"What exactly is it?" Bai Song asked.

"It looks like foam, which is not fireproof." Wang Huadong explained, "It is also used for sealing, but in the wrong place. How can you use this between two sliding windows? Can you still open the window like this?"

“Is it freshly sprayed?”

"There's no way to be sure about that." Wang Huadong said, "Because aluminum alloy conducts heat quickly, there's still a little bit left in the cracks. I'll go to the Criminal Investigation Department to do some testing later."

"Any other discoveries?" Bai Song asked.

"Also, the four bottles of wine brought by the deceased's children were all burned and exploded, but only a part of the other wine in the deceased's home exploded." Wang Huadong said.

"That's normal. Children always bring strong liquor." Bai Song said.

"No, most of the beer in the deceased's house exploded, and only one bottle of white wine was broken."

"Is it possible that the wine that the children brought was too close to the center of the explosion?"

"That's the situation."

"That's normal."

"I still feel something is wrong..." Wang Huadong was a little annoyed: "The main reason is that when putting out the fire, no one considered protecting the scene at all. The scene was full of water and glass fragments were everywhere."

"What else can I do to put out the fire..."

What annoys explorers the most is never high corrosion or anything like that. What they fear most is this kind of change in the scene, especially a drastic change.

"But……"

"If it wasn't difficult, we wouldn't be asked to come here for the case," Bai Song consoled.

"Okay." Wang Huadong finished the bowl of chicken soup and nodded.

What Bai Song didn't know was that this simple sentence would eventually become the motto of Team 5.

…

After studying the children's statements, there was no problem. The scene was damaged too badly. Wang Huadong's discovery of this thing in the gap of the aluminum alloy was already a very important discovery.

This may mean two things. One is that Yao was afraid of the cold and sprayed it himself, and he basically didn't open the windows in winter; the other is that someone deliberately created a more sealed environment.

The first situation is possible in cold weather. After all, these houses are drafty in winter, and various types of tape are common.

"Wang Liang, go check the video again to see if the windows have been opened in the past few days."

When you are with others, you usually address them by their names, and only address them by their positions when there are outsiders around.

"Okay." Wang Liang looked at Bai Song and said, "Don't be too stressed."

"It's okay. The one under the most pressure is Team Zhuang." Bai Song waved his hand: "I still have ideas. You don't have to worry about me."

"What's the idea?" Wang Liang asked curiously, "Tell me first."

"There is only one accidental event in the case, and that is the heart attack. If there was no heart attack, the deceased was not burned to death, and if there was indeed murder, what would be the follow-up action?" Bai Song said, "This is the idea."