Stand your ground has to be disproven first. The manslaughter is the charge that he will be tried on if, if stand your ground is disproven.
Understood, but the threshold for "reasonable" still remains. FL use of deadly force
776.012 Use or threatened use of force in defense of person.—
(1) A person is justified in using or threatening to use force, except deadly force, against another when and to the extent that the person reasonably believes that such conduct is necessary to defend himself or herself or another against the other’s imminent use of unlawful force. A person who uses or threatens to use force in accordance with this subsection does not have a duty to retreat before using or threatening to use such force.
(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.
The grounds for use of force don't change simply because there's a pre-trial hearing as provided for here.
776.032
(4) In a criminal prosecution, once a prima facie claim of self-defense immunity from criminal prosecution has been raised by the defendant at a pretrial immunity hearing, the burden of proof by clear and convincing evidence is on the party seeking to overcome the immunity from criminal prosecution provided in subsection (1).
The fact that McGlockton did assault Drejka would trigger the prima facie claim. A person on video unambiguously retreating from a presented firearm, literally until the moment he was shot, should* meet the burden for denial of immunity.
*I say should because I've no idea how it's going to play out as, and I'm sure you're well aware, legal stuff can get weird. I'm all about armed self-defense and fully support the idea of no duty to retreat but if this is an example of what that's supposed to include we need to get the paring knife out and start carving on definition.