Yeah......that occurred to me in shower. It was on Bitfinex. Bitfinex is shady as fuck, there are traders on that exchange who know where the stop losses are set. Large stop losses were triggered and the resultant market order was filled with a market order.

It wasn't some idiot, it was someone being robbed fkn blind by the crooks on Bitfinex. Have seen it many times and have even been the victim of it, which is why I don't trade with stop orders on Bitfinex.