Funny, but not so far-fetched.I put that on Rolle, he could have stuck his foot out and tripped Harrison.
Had a sideline player tackled Harrison it would have been a personal foul, +15 yards from the spot of the foul. With the clock having run out, or very near to it, Pittsburgh would have been given just one play from the resulting spot. Very unlikely that it results in a touchdown; a field goal maybe...
Oh, well!