The concept - no retreat from where you have a right to be - is clear. The APPLICATION of the concept to everyday situations is not so clear to me, and it's going to take some working out before it is.
The difference between SYG at home and SYG in public is that, at home, it is prima faciae reasonable to presume the home defender is without fault.
In many public situations, this is also true - but not all. If I understand the Florida SYG law, SYG confers immunity from arrest or prosecution. There are many brawls tha happen among ordinary people where "fault" is hard to figure out. It can't be right that if you don't avoid an avoidable fight, and the fight goes against you, that you can end it with a shot.
Discovery of the truth in confused situations belongs, as it has for centuries, to grand and petit juries. This process should not be overridden by across-the-board application of SYG.
What about 10 Rod Road? Your observations on this.