Well, it became a legitimate defense of self situation as soon as he approached with a sword. Now the question is, do you just say,
"Okay, it's not worth it ... just take my stuff and leave me alone,"
or do you stand your ground with your stuff, and defend yourself against the attacks meant to drive you away from your stuff...
it seems its open to dispute who's legal property that cart is.
did LE arrest him for attempting to steal the cart , or for his sword attack?
to a jury it would depend when you did shoot....when he was coming at you with the second swing
or you hesitated and did it when he began to withdraw/step back..
I don't see any justification to attack someone with sword, cart or no cart in dispute,
what matters is whether or not the person attacked is facing serious imminent threat.
Florida. "Justifiable use of Force"
776.012. Use or threatened use of force in defense of person.—
(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.