"The Cheesehusker, Trade Warrior" wrote
> that's a play where you throw your hat - not blow the whistle
Since the rules don't allow that, no, you don't. The rules simply
don't allow for an official to rely on instant replay for the right
call. (And that's what you're saying 'throwing the hat' would
mean - let instant replay sort it out.)
If you see the player step out-of-bounds, you call the play dead.
If you're in doubt - you don't do anything.