Forgetting one thing. In America he is innocent until proven guilty. He doesn't have to prove his innocence with things like a spent round. The complainant has the burden of proof.
Ok assuming he got away with it would it be worth the hassle? I guess that's a question only the OP can answer.
That said ,I have to agree with Kwimby. I am convinced the OP saw a chance to use his gun to intimidate those folks and he was an absolute Richard about doing it then came here to brag about doing it