Guys, please don't over-officiate this. The key idea is safety -- in this case, protecting them from themselves, so to speak. Don't penalize instinct; penalize action. If you can prevent him from participating by saying something like, "stay out of it," or "your done for this play," do so. You might even tell him to go ahead and make his way to the sideline as he's out for a play. (Talking about the officials who are "cleaning up," not those officiating the action). Just make sure the foul called, if at all, is deserved.