lol @ threatened with death
heres some REAL advice
firstly DON'T carry your own knife, dunno what it's like in the USA but over here they'll put you in court just for carrying one. & chances are if YOU pull a knife on someone with a knife, their life is threatened and you will get hurt...
Also only weak kids get mugged, toughen up. they tried to rob you, 1 punch to 1 person is a disruption and you could of got away free, plus no one really takes revenge on 1 little punch
best thing to do in ur posistion is just stay around people, people usually only get targeted on their own
lastly, don't act like the rush you felt didn't feel just a little bit good.
oh & whatever you do don't get shook up about it, just forget it, learn from ur mistakes and move on.