This is a very reasonable scenario and we should all train accordingly. Strength and endurance are very important and I try to jog and lift weights at least a few nights a week.
Situations like this are scary, we try to be prepared but it's a tough 24/7 job. Look at what happened with Zimmerman - saw some guy who looked suspicious, called the police and got out of his car to see where he ran off to. A few minutes later he's laying on the ground being pummeled. Not a smart move on his part, but he found himself on his back desperately trying to get his gun with a guy on top of him. So his problem became two fold: shoot the guy beating you senseless AND make sure he doesn't grab it the gun.
Your right, not a smart move by Zimmerman. In fact, pardon my french, George Zimmerman is a dump f who went out looking for trouble and when he found it he was too soft to take on a 17 year old kid without pulling his gun. To top it off he was told by 911 dispatch to not go after the guy yet he just had to play the volunteer policeman role because he was a neighborhood watch captain. Ya, he went looking for trouble and when trouble found him he couldn't handle himself without using lethal force and yet I do believe he was in fear for his life when it happened so technically he was covered by stand your ground even if he was a dumbass while doing it.
Being strong mentality as well as situational awareness, and physical prowness are a big part of self defense. You should know what the heck is going on, where the threat is at, how big the threat is, and what are your options for dealing with the threat. In some states you may not be under an obligation to retreat yet I still believe that if you can disengage and fall back then that should be one of your first options in dealing with a situation. There is no shame in retreat despite what some may say. If you do have to confront can you do so verbally or if you go hands on can you handle yourself? Lethal force should and always be your last option. Force is a weird thing, there are going to be different answers for different people. Ive seen in this thread where some of our older members have posted and given a situation thats turning physical they would be correct in using lethal force, especially if they can't handle themselves going toe to toe with an aggressive person. Myself it would be different, I'm a 6'2 300 former offensive lineman that can have a nasty disposition and can take a lot of punishment when the time comes for it and I have a little training in physical confrontation. Given the scenario that was posted I'd probably mind my own business or try to calm the dude down until it got physical then it would be attitude adjustment time until the threat was gone or law enforcement arrived.
Oh wait, this is a different troll thread he started, I thought I was posting in the DMV or postoffice one. Either scenario same result. Mind your own business until it gets to a point where you can't, try to talk the dude down a bit, then attitude adjustment. I wouldn't have an issue getting my gun out, I have a holster made by Dwight and its a dream to wear.
Anyways if I was in a fight and couldn't get my gun here is my prediction or answer.