cdinusa-
All the OP said was that there were people in front of him, people behind him, and he didn't like the way they were closing. This is a long way from; "I was in reasonable fear of my life and the only thing I could do to save my life was use deadly force". If they crossed the street, you can too. See if they follow you, walk a different way. Yell at them. Pull out your PHONE to see if they react to it. Change direction to see what they do. The distances described do not indicate that he was in imminent danger. At this distance, how were they going to hurt him? He did not see weapons present. They COULD charge him. They COULD show weapons. They COULD move to close him in. But none of these things are indicated in the situation. A million things COULD happen. I am commenting on what he described, not ASSUMING more.
If they charged, I would certainly draw with the intent to do whatever I had to to stop their actions. I don't want them to GET close enough to hurt me. When you are being charged from the front by two assailants, it is reasonable to draw in enough time to stop them. IF THEIR INTENTIONS WERE NOT VIOLENT, (or they had a sudden jolt of wisdom,) they will immediately stop their actions. But it's still "Face down on the ground, hands behind your head." If the gun comes out, the police are getting called. The first one to call the police is the victim, I'm going to make sure it's me and not someone else. Otherwise, the police will be responding to a "Man with a gun" call, and I will be forced to prove that I drew in self defense, not as the aggressor. The bad guys will have 3-8 minutes to think of a story that isn't the same as mine.
In this case, there were two in the front AND two in the rear. I will put my back to the wall where I can see all of them. If their intentions are to harm me, I will be forced to take on four assailants. This is always bad. This is why I WILL DO EVERYTHING I CAN TO AVOID FIGHTING THEM AT ALL. Again, if they see the gun and get a sudden shot of wisdom and run, I will call the police immediately. If the gun EVER comes out, it means there is a crime to report. It is impossible to control four bad guys with their hands behind their head in two different directions from me, so I wouldn't try.
But: AGAIN: This didn't happen in the OP's description. All it was, was two guys in front, two in the back that he THOUGHT MIGHT be boxing him in. If you draw in that situation, the two guys in front could just as easily run around the corner and call the police because some guy up the sidewalk just pulled a gun on them for no apparent reason. He was a LONG way from justifying deadly force.
I don't have to wait for someone to throw a punch. On the other hand, if he DOES throw a punch, or even hits me, but I AM NOT IN REASONABLE FEAR OF SERIOUS BODILY INJURY OR DEATH, I'm still not justified in shooting him. It is all situation dependent. This is the discipline you must have if you carry. You can't shoot someone just because they hit you. Just because they hit you doesn't mean they were going to injure you further.
If a drunk guy who is my size or smaller starts calling me names, thinks I hit on his old lady, charges me, I step out of the way and he falls down, no, I'm not going to draw on him. I really don't think he's going to hurt me. But if he's drunk, gives me a hard look, reaches into his pocket and charges me, I will be drawing with the intent to stop his actions. I may have a chance to shove him backwards while his hand is still in his pocket, but if not, I'm going to shoot.
If a guy charges me, and I know from previous experience with him that he is violent and will try to harm me, I will give him less leeway than a total stranger. If I have a neighbor with a history of domestic violence and alcoholism, and there is noise in the night and a frantic knock on the door, and his old lady needs to come in to escape, I see him in his doorway yelling and threatening, I will have my gun ready, but I will not SHOW the gun until he charges. (That one actually happened to me. He stayed in the doorway and I bolted the door and watched him until the police arrived. To this day, he doesn't even know that I was armed.)