found this on the LSU forums,
"If a player's helmet comes off, he must leave the game for the following down. The only exception to the rule is if the helmet comes off as a result of a penalty (face mask, for example). If the ball carrier's helmet comes off, the play must be whistled dead immediately. No more running into the open field without a helmet.
If a player who is not the ball carrier loses his helmet, he must stop playing. He cannot make a tackle, continue blocking or running a route, for example. If he continues prolonged participation without a helmet, he will be whistled for a 15-yard penalty.
With less than 1 minute remaining in either half, if the ball carrier's helmet comes off, and that is the only reason the play is being whistled dead, there is also a 10-second runoff. If a team has a timeout remaining, the coach can elect to use the timeout instead of running 10 seconds off the clock. But the player must still leave the field for one play, unless his helmet comes off as the result of a foul."
Ok so I am on my Goal line the OP is about to get the winning TD with >10 seconds on the clock, I can remove my helmet, have the play wissled dead and drain 10 seconds for the win?????