Instinct tends to do wonders - let it go and get the hell out of there as fast as possible using any means possible.
I once saw a friend overpull what he thought was going to be a heavy clean somewhere around 400-420. He caught it rock bottom as it crashed down a bit, he thought he was stabalized but then his eyes went wide as he realized it was going back (and taking him with it, likely pinning him by his neck/throat to the ground). I never saw a 330lbs guy move that fast in my life, from eyes wide with the realization of horror to spining, jumping, all 4 limbs flailing and scraping for purchase on the floor as he tried to get the hell out of there. Quite memorable.