That is untrue. Simply thinking your life is in danger is not a justification for the use of deadly force.
But having the physical altercation (that Martin initiated) escalate into a gun grab by Martin and Zimmerman hearing "you're going to die tonight motherfucker" from Martin, IS justification for the use of deadly force.
What part of the burden on the state to disprove Zimmerman's affirmative defense, to prove that Zimmerman's account is wrong and that he acted with malice, with a “depraved mind” when he shot Martin (to support the charge of 2nd Degree Murder) don't you understand?
All the BS that you think is so compelling and so important becomes meaningless without the state providing evidence / testimony THAT PROVES THE CHARGES.
There will be a motion to dismiss when the prosecution rests and it should be granted.