No doubt. Probably hadn't been drinking enough water....
I got a lesson in that yesterday. Felt weak, dizzy, headachy and out of it and found out I was mildly dehydrated. Got a lecture from the medic about staying hydrated and NOT to drink Gatorade when I've been outside for a while. (Didn't know about that one...I do now.
I wish this poor guy had had the warning I did yesterday. I'll be sucking down plenty of water from now on.
It hit 118 here yesterday.