Wow

[Falcon182]

She had just jumped when I stopped, she did survive but I think she literally dived into a face plant cuz her face was annihilated.  The ambulance was there in a few minutes and there was nothing else I could do so I went home.  But yea I can't get that whole thing out of my head ... just crazy.

Make sure you see someone if you are having problems dealing with this. Most of us civillians aren't trained or wired to deal with sudden and unexpected trauma cases like this.
It's totally normal not to be dealing with it well, just make sure you do something about that (like talk to a councillor or something). That part is up to you.
And once again, good on you for stopping. +1 for humanity.

Good call. Big props for being a good person and stopping. Most people, even those who consider themselves "good people" wouldn't stop so it takes something to do what you did.