Have another drink then drive yourself home

Last night we were driving home from town. As we passed the North Mt. Shasta on-ramp, a small white car merged on in front of us. At first they were traveling under the speed limit, but soon speed up very rapidly. They also swerved slightly crossing over the right side road line. Rachel and I wondered, "is this guy drunk?" We continued to watch him as he swerved back and forth and proceeded to zoom ahead. I decided to try to catch up and get his license plate number and as Rachel was asking why I was missing our exit, I said we should call it in. I got up to 70 for a while trying to catch him, but it was no use. He was going anywhere from 80 to 100 mph. Just before our next possible exit however, we caught up to him as he must have slown down considerably. So as we passed the truck village exit Rachel got out her phone and dialed 911. The car speed off again and we couldn't see the plates. A ways ahead we saw the driver change to the fast lane to apparently pass two semi trucks. It passed at least one then we saw headlights go straight off the right side of the road. The semi stopped and as I stopped my car behind the truck I was already thinking of the things I might have to do or see and it was freaking me out. Two guys got out of the truck and were shining a flashlight down at the upside-down car. With strong accents they said, "see the fire?" There was a dancing light at the front of the car. One of the guys went and found a fire extinguisher in the truck, but the look on both their faces made it clear they had no idea what to do. So I grabbed the extinguisher and started hiking down to the car as Rachel was making another call about the fire. The gas fumes were so strong I could literally taste it. I was a bit worried the car was going to burst into flames in my face, so I just wanted to put the fire out ASAP. I covered the engine with all the contents of the extinguisher. The guy with the flashlight was half way up the hill giving me light and I guess Rachel was being asked if we could see anybody, which I was making a point of not looking in the car for fear of seeing something horrific. The guy told her "lot of blood" as he pointed towards his head. Now I really wasn't going to look. Having little to no medical knowledge, and knowing trained help was moments away, when the fire was out I was done. I really didn't want to pull someone out and end up paralyzing them for life. Plus I really didn't want to see a severed limb or head. The CHP arrived quickly and got the man out of the car. He seemed to be alright beside the bleeding head. They got statements from the truckers, Rachel and I and we were free to go. So as the story is intense and might sound like I'm awesome, I was really just a scared little girl who was the only one who knew how to use the fire extinguisher. But I feel like I would be more prepared next time. I was caught off guard, but now I feel less scared of a mangled body and more willing to actually see if I could help more. Hopefully I won't have to though.