I would like to request everyone be nice to emg, as he is the only leading indicator I know of.
He made it clear a long time ago that he trades 1 lot per $100K in his account and averages in 1 lot at a time. During the flash crash he posted his initial entry, and an add-on (maybe two). So before we lost all communication, he had 2 or 3 cars on in the low 1100's after the market had already fallen nearly 100 pts off the April high. Since there was no major news event driving the crash, the chance of a bounce was very good. Even if the market halted below 1050 and re-opened lower yet, I don't think he was in danger of blowing out his account because of his size-based risk management.
Averaging down isn't my cup of tea, but position size is a form of risk management when using this strategy.