Those people attacked him prior. His weapon was not illegally acquired.

@jachee: You don't have to "transfer" a gun to carry it across state lines, only when you first buy it through the FFL.

@croes: being armed by itself is not a threat, if you point a gun at someone you are the aggressor and that person can defend themselves.

just because you "see" someone with a gun doesn't mean you can shoot them, if they aim it at you that's another story. the first aggressor matters.

@happytoexplain: no you would be wrong to try to restrain the man who is simply armed. if that state had a open carry law you would be in the wrong trying to confront him if he was not pointing it at you or others. there are plenty examples of both sides openly carrying at protests.