He took a helmet to his jaw area. Like a good hook I bet it shook his brain. He looked confused on the next play call. That's why he got taken out. Lets hope the young man heals up good for his future. Head injuries are bad news.
Looked to me like he took a helmet right to the elbow and/or bicep. A really bad bruise can affect your play; a joint injury scarier. I don't know anything, just going by what it looked like to me.