What would you do if you saw your worst enemy/rival/whatever about to die?

Let’s say there’s this guy/gal that always goes out of their way to treat you like trash. They always try to make you look bad, twist your words around and spread horrible rumours about you in order to turn everybody against you. They cause you to get shunned by your own peers and lose friends.
If you had a job they caused you to get fired from it.

One way you see them in a life-threatening situation (dangling off a cliff/suffering a potentially fatal allergic reaction/getting mugged by a thug or simply needing medical attention).
If you refuse to help them nobody would know and you would face

Would you save them or would you leave them to die?

Modhat: Closed as pretty much a duplicate thread. I was about to change forums and realized this was pretty much a repeat Op from just a few days ago.

Please see the existing thread on this subject from poster.