I can’t believe the prosecution put this guy on the stand. What were they thinking? Whether you believe this guy or Ms. Creole Porkchop, the prosecution practically nuked their own case. What is it about “reasonable doubt” the prosecution doesn’t understand. If some kid has you on the ground and is punching your lights out and you have a gun in your hand, why would you *not* use it? You have no assurance the puncher is not trying to kill you.
I don't think Mr Zimmerman intended to use the gun at all. When the punk saw or felt the gun, it was then a do or die moment for Mr Z. (Didn't they struggle over the gun?)