[Ref in PA]

If I suspect a player to be injured (a concussion in this case), I will blow my whistle and stop play. I will beckon the coach and send him off. I will convey my suspicions to the coach, explaining why I think there is something wrong with the player (erratic behavior, stumbling, etc.). If the coach wants to sub the kid back in there is not much I can do about it.

"Mr. Lawyer, I did send the kid off and conveyed to the HC my suspicions, but the coach made the decision the kid was ok and sent him back in."