wow, man glad to hear he is ok. I just wanted to reinforce Rages comments. Having had more concussions than Tom Brady (not kidding) due to hockey, football, and being clumsy, it is very important to monitor a victim for several hours. Often the symptoms don't mainfest for awhile. If they want to sleep, and they will, it is important to wake them every so often and ask a few orientation questions. Swelling can make an idiot out of you (it helps if you start that way:) Narrowed vision, nausea, a broken visual field (i used to say it was like looking at Picasso paintings, little pieces every where) are all common. If you want to scare the sh*t out of your mom, start talking jibberish in response to her questions. So always take a head shot seriously. Live to ride, ride to live.
peace
db