castle applies in the home or truck. he lost castle once he hopped out and pursuied him when trayvon ran.
if trayvon got goofy when zimm was in the truck, it's a quick and clean shoot.
Florida's CD got amended when I was living down there to include peaceable passage in a public way. Basically, a castle "bubble" that floats around you if you are acting lawfully. Dunno if its 100% applicable, because this isn't a SYG case, but a self-defense.
Also, the rules of disclosure and evidence are much looser in civil court. There would appear to be a lot of shit out there about TM that the family might not want aired.
For instance, there is a rumor out in the twitterverse that TM's dad is a Crip named "Fruit" and was the one texting TM about buying guns.