As a citizen I will not capture anyone (in public) or hold them at gunpoint. If they stop attacking, its a good time for me to get the heck out of dodge. I am not a security force or a policeman, I will not capture criminals, get between two fighting men, chase purse snatchers or investigate odd happenings in dark alleys. If I can safetly escape danger, I will..and when I cant I will fight like a banshee. As far as restraints go, there are things called prone restraint hypoxia, nerve and tissue damage that ( after the fight is over) may not be considered part of a "lawful use of force". LEO have a duty to capture people, I do not. If a badguy claims that his left thee fingers no longer function properly because of improperly applied restraints, what will a civil jury say? Even if the badguy is lying, its like trying to prove someone doesnt have backpain.