I feel pretty confident that If I had submitted an order at $185 and gotten filled, then it ran back up - that IB would have busted that order and SOMEHOW I'd be on the hook for squillions in losses. It's the old trader's adage about when the school marm starts dancing on the table. You watch from a distance and don't get involved as something is terribly amiss.
I think that actually happened like 10 years ago. People were buying stock at a penny and selling at market only to find out the penny buys were busted and they were still short at the current market.