Been in a similar situation, except it was a girl hit by a truck on a busy main road, and her injuries were very much life threatening. (She is okay now, but damned lucky to be, she was in hospital for a few months). Fuckers still kept driving by right next to where she was, we couldn't move her as we could see she had some nasty head injuries but had no idea if she had neck/spinal damage and you don't move people that seriously injured unless you HAVE to. There was even a side road RIGHT NEXT to where she was that they could have gone through. Thankfully an ambulance and the police showed up pretty damned quickly. Most terrifying morning of my life.
It is. :/ I couldn't get his license number though. The cops DID show though and that same guy that yelled did mention it to the cops. Not much else could be told to them -- gas leak, smoke, possible fire. They cleared the rest of us out of there quick when they showed.