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"I'll kill you, you mess with the wrong guy I fight for a living" I would have shot him. Threat to life.
I assumed he meant he fights innocent bystanders on the streets for a living. Possibly hobos at late nights.
So did that other person instigate with the vulgarity like he claimed? I think making terroristic threats in front of a cop without being charged or subdued is some kind of privilege, although the officer was right to not escalate.