When Father Su finally got into the truck, the police officer saw him fall again and thought that he might have a problem with his legs. So, he didn't think too much about when Father Su fell on him.
Father Su slowly gets up and sits in the corner. After everyone got in the truck, two police officers also got in the truck to escort the prisoner.
He sat in the corner and carefully began to remove the handcuffs. After another prisoner saw what he was doing, he blocked the police's view with his body.
Fortunately, this key can be used to open all handcuffs. So, after Father Su freed his hands, he leaned closer to another prisoner and helped him unlock the handcuff.
The police officers didn't notice anything was wrong with them and were still chatting among themselves. When the truck left the county and reached a deserted place, the prisoners looked at each other.