Police cadets are worse. How did Lin die?

I won't know until I see the back. After Lin died, Joe unconsciously closed his memory and slowly recovered it.

Real picture:

Lin was held hostage by gangsters, and Joe rushed out (all the way here). Joe saw Lin being held hostage and held a gun in a standoff with the gangsters. After that, the gangster pointed the gun at Joe directly, and Joe didn't dare to shoot. Later, the gangster shot Joe, covered his ears and fell to the ground, but he was conscious. At this time, the gangster wanted to shoot Joe. Lin got rid of the gangster, blocked the bullet that the gangster fired at Joe for Joe, and then hung a tune. The whole process was watched, and finally the gangster walked away and Joe fainted.

So Lin was hung up by Joe, and Joe never dared to shoot again.