Getting into a fist fight with someone (even if they hit you first) who isn't massively larger than you isn't a legit reason under law to draw a weapon.
Not singling anyone out here, just picking the last statement about the big guy hitting the little guy. I have been the big guy all my life, and most fights I have been in have been started by some little puke with something to prove. When I was in elementary school I got my butt kicked a couple of times because my parents drilled it into my head that it was not proper to hit someone smaller than myself. I got tired of that and started hitting back. It worked great!
If someone big or little, individual or group, comes up to me and starts to threaten me, they may not get shot, but they will find out that I am carrying. I see these threads, and I see the endless analysis, and I have to wonder how many people here have really been in any sort of situation. Sorry, but no one is laying a finger on me or anyone with me. I am not going to let myself get "a little beat up" to avoid the possibility that I might be charged with brandishing.
In the vast majority of cases, people who start these things do not do so out of the blue. They are not honest, law abiding citizens who suddenly snap. They usually are already known to the local LEOs. If it is your word against someone like that, who do you think the cops are going to believe? Been there and done that a couple of times, not with a gun, but in one, I had to take a knife away from a
little guy who was determined to stick me. I disarmed him and beat the stuffing out of him to keep him from continuing his aggression. When the cops arrived, he demanded I be arrested for assault. The LEO in the room replied, SHUT UP! Whatever he did to you, you deserved!" He went off in handcuffs, and I was told to have a nice day.
But regardless of the official attitude, I was not about to get "just a little bit stuck" with a kitchen knife to justify my actions, just like I am not about to get knocked around by the BG so as not to have to pull my piece.