that guy aint gonna do anything with that 50 cal. the amount of time and effort he has to go thru to be able to use that against you effectively is too much considering how close you are to him. mess up the belt right near the firearm and he might be able to get 1-2 shots off at most if he even gets a chance to. additionally, he would have to rack it unless he's insane enough to be driving around with that thing already racked without anyone manning it.
basically, this guy is prolly the least threatening guy out there because he's so over the top with threatening others; he did a loop back to the other end of the continuum. like they say in Cuba, "a dog that barks does not bite." to me, this guy is saying, "if there is any sort of violent altercation coming, kill me first."