776.032 Immunity from criminal prosecution and civil action for justifiable use of force.--Florida Statutes - Chapter 776(1) A person who uses force as permitted in s. 776.012, s. 776.013, or s. 776.031 is justified in using such force and is immune from criminal prosecution and civil action for the use of such force, unless [the person is a police officer, lots of stuff snipped]
So, if there is a finding that the use of force was justified (self defense is a justification), he's immune from both criminal and civil proceedings.
If there is a finding, by a jury, then he never had the immunity on the first place. That is, finding by a jury means there was a criminal prosecution (or a civil one - but here we are talking about whether or not the civil one can go ahead)
Thank you (for researching that, or for enduring the grind of law school in FL)!