The Koreans in the Rodney King riots shot back and the looters backed away and found some other stores to loot. Antifa are fascist revolutionaries but they are not jihadis who have the prophet’s promise of paradise. Most are atheists and when faced with the end of life at 23 or 24 I doubt their first thought will be to rush the shooter. Now how the law reacts will depend on the jurisdiction but nowhere in the Common Law is it required to submit to a physical beating when you have a means of seLf defense and numbers of attackers and location make retreat problematic.
As I said, once the mob starts beating you (giving you a self defense-legal-defense in court) getting off a shot can be impossible.
You probably wont be holding a gun anymore.
Read the articles posted here about being attacked by a single bear. They are lucky to get off a single shot before the bear tears them apart.
Once you wake from your coma you may find the Antifa claimed you fired first and they were just being heroes.
Anything can sound easy posting anonymously and safely.