He did disengage and then Martin took it upon himself to assault Zimmerman.
Care to show anywhere that Zimmerman says he thinks Martin is armed?
first, how do we know that mart assaulted zim
second, zim stated that mart had something in his waistband that he thought might be a weapon (this is from memory so i do not have the exact cite)
third, if zim had stayed in his truck, mart could not have assaulted him, so why did zim get out
forth, why did zim not stand down when the dispatcher said 'we do not need you to do that'