Thank you all for your input, you have all helped me a great deal. As for the size of the rock, it was medium sized, it wasn't a stone, but it wasn't like a boulder either. As for the speed, we are actually still trying to figure that one out, no one wants to confess about who threw it. As for the c-spine stabilization, why did I do it? Well there were two other EMT's on scene, and we made the decision as a group to do it because we were looking at a head injury. Stabilization was done in a timely manner and ALS was not on scene by the time we went en route, as a matter of fact when we went en route they were still 3 to 5 minutes out, and its 10 minutes to the nearest facility. Oxygen, I admit 6 lpm is a lot, but my protocols state that 1-6 is by NC anything higher is by NRB. I probably should have only done 4 lpm, however the oxygen did seem to help. As for the pain scale I normally do say 0-10, this call was back in August, so I don't remember exactly if I said 1-10 or 0-10. As for a MOI or indentation of the skull, no, from what I could tell as a Basic, there was no indentation of the skull. The only thing he had was a laceration. He was diaphoretic upon arrival however it was hot outside, his pupils were PEARL, and his vitals stable. The doctor even told me I did a good job for boarding and collaring him, he offered me a cookie and everything.