If you're a black man in America and a white man wants a gun at you with two other white men to back him up I don't think the black man would expect being treated properly by the three white men. Their aggression caused the whole situation. They are responsible for what transpired.He was trespassing....and then left the scene in a hurry.
And if he's trying to grab a gun from someone...he's committed assault.
Anyone with half a brain who's had a gun trained on them like I have knows you don't ever try to disarm the person holding the gun...especially when he's pointing it at you. Chances are pretty good you're gonna get shot. If you keep your fucking mouth shut and do what you're told chances are you'll live thru it.