"As for you freezing up? It is a common stress reaction. I can remember my mind going completely blank trying to take simple histories from patients when I was on practicum. That said, being a rookie is no excuse not to do your job."
Cut the guy some slack, he came in here asking an opinion, and admitted he had a brain fart. Also, try not to contradict yourself when you answer his question. Either it's normal to freeze up as a rookie or not, can't have it both ways.
Otherwise, had I been the medic on scene I wouldn't have been overly happy with you. We would have discussed it after the call and moved past it though. One thing, get a report from the fireman/ 1st responder about the wound and unless it's bleeding through, leave the bandage in place. Also, unless it's grossly filled with grass, dirt etc. I wouldn't have tried to clean a head wound especially enough to see the skull.