I can recall about four times where an electronic market was swept. Two of those times it took the market some length of time for the order books to populate (if you want to call it that) - and it was super thin and full of gaps. Point being - if he had on 212 cars at one cent, and then the market was swept and the best bid was (-$3.00) and he hits a 10 lot - he's marking down $636K at that point in time... He is going to be paralyzed with fear and disbelief.
Ironically, if IB had their shit together he probably would have panicked to sell out of everything as soon as he saw a negative print, after thinking he just bought the absolute low a few seconds earlier.
