I'm going to tell a story that may or may not be true. A story with an important lesson for anyone who practices an art or a warrior system.
As the story goes an MMA fighter was mugged at knifepoint one night. The fighter quickly countered and put the mugger in a chokehold but didn't disarm the mugger. It looked bad for the mugger.
The mugger then does something odd: he "taps out" like an MMA match is finished, by tapping on the fighter's arm. He basically surrendered and in keeping with training, the fighter released the mugger. Immediately the mugger turned and stabbed the fighter seventeen times and fled.
The fighter survived.
The moral here is this: a street for is not a game with rules, and *watch for training scars*. In this case the fighter had trained himself to release at the tap out. The attacker knew this, knew of this reflex and used it to get away.
This idea of ingrained reflex is what mm makes kata work on Asian martial arts, but improper follow through or weaknesses can be as trained in as proper technique.