http://youtu.be/IXmgfgAhea4 Was the force reasonable?? Doubt it but might make him realise time for a career change.
He had a firearm and was a threat. If they were honestly scared for their lives, which in all likelihood they were, I don't see them getting in any kind of trouble for their actions. Will he re-offend? Probably. Stupid is as stupid does.
there's also the chance that he reoffends and simply opens fire or stabs people before taking the chance of being resisted...