Original sentence: During the transaction, Chance tries to arrest Masters and his bodyguard, but the bodyguard pulls a shotgun from a locker and shoots Chance in the face, at the same time Chance shoots the bodyguard in the chest
Edited sentence: During the transaction, when Chance discovers he has been set up and tries to arrest Masters and his bodyguard, the bodyguard pulls a shotgun from a locker and shoots Chance in the face, at the same time Chance shoots the bodyguard in the chest