"You shouldn't be able to remember that!"
When he woke up he was laying face down in the dirt and couldn't remember how he got there. There was a horrible pounding sound in his ears that was more than just a headache from having been knocked to the ground, but he couldn't recognize it right off.
He couldn't recognize anything, he almost realized. The truth was that even when he woke up, he wasn't really awake. While he might not have a concussion, he was certainly disoriented.
He had enough sense to know that laying down in the dirt wasn't what he normally did, so he decided to change things a bit. He positioned his hands underneath himself and realized he was pushing gravel. Gravel on tarmac, actually. So he raised himself to his knees and looked around.