Possibly, but then again probably not.
My wife is a hospital doctor and done her ATLS (Advanced Trauma Life Support) ie she gets called to serious incidents and crashes in hospital. Driving home one night she came across a traffic accident, stopped to help out. She did all she could but needed some equipment/drugs to help the person out. A fast responder turned up, and she was amazed that he didnt have the equipment she needed. The ambulance got there 30mins later in which time the person had died.
She was amazed how little equipment the responder carried compared to an ambulance (and they tend to be less well trained). She said granted the person still would have probably died, but if the ambulance had got their before the car, she could have done more.
She later talked to colleagues about, and they all pretty much said the fast responders, cant really help!