My issue is with the guy who threatened him. I hate it when people do the whole blocking thing and try to bully you. I would tell him what someone else suggested and say calmly "Keep her BUT i do have an issue with your 'ass kicking' threat you know that quote 'only thing worse than a woman scorned is a man with nothing left to lose?', I'm prepared to face death or jail for years as long as i take one or more of your body parts with me, are you?". This i would say if i was REALLY pissed off (which i would be since the girl would've pissed me off already) and i was ready to take anything and the dude would hear it in my voice or see it in my face.
Second thing i could say which i tend to do more is look him in the eye and ask him "Do you want to die?, you may think you'll kick my ass now because you have 4 guys with you but i'll only be focusing my entire energy on you and i guarantee the rest of your boy scout will regret ever meeting me before the end of the week. *evil coy smirk/smile* Who do you think you're effing with?". Then i'd turn away and start texting on my phone. I only say this because i know people who can make stuff happen...'within reason'.
I find most of the guys are pussies and if you make a huge threat (be wiling to back it up tho) with a serious calm tone. They become scared and back off, maybe because i'm black though.
However, after calming down whilst writing this post, i have to agree that no girl is worth fighting over hence i'd ignore what he said and just walk away from the whole bad situation and go somewhere/something positive. However, you should never have gone out with her in the first place.