Florida Law said:
776.012 (2)
A person is justified in using or threatening to use deadly force if he or she reasonably believes that using or threatening to use such force is necessary to prevent imminent death or great bodily harm to himself or herself or another or to prevent the imminent commission of a forcible felony. A person who uses or threatens to use deadly force in accordance with this subsection does not have a duty to retreat and has the right to stand his or her ground if the person using or threatening to use the deadly force is not engaged in a criminal activity and is in a place where he or she has a right to be.
That's the law that got Zimmerman acquitted, and it will get this guy acquitted as well, because it is
terrible law and it applies exactly the same in murder cases as manslaughter cases.
"Sir, did you believe you were in imminent danger of great bodily harm?"
"Yes."
"The man had just pushed you to the ground, is that correct?"
"Yes."
"Was he armed?"
"Uhhh..."
"Let me rephrase that. Was there any way for you to tell whether he had a gun in his belt?"
"No."
"Knife?"
"No."
"So, once again, did you fear for your life?"
"Yes, absolutely."
That meets the letter and intent of the law, and if by some weird twist the jury disregards that fact he will win on appeal based on the judge obviously giving the jury inadequate instructions.
Notice that the law does
not say anything about "were you being rude and confrontational?" or "did you in fact start the altercation in the first place?"
He was in a parking lot, where he had a right to be. While he may have been being rude, playing at parking code enforcement without actual employment in law enforcement, and overall being a (repeat offending) jerk, there is no indication or claim that he was "engaged in a criminal activity."