BITFINEX:LTCUSD Litecoin / Dollar
Such a low market such as LTCUSD serves as an example of why you must set conservative limit orders. What likely happened is a selloff triggered a cascade of stops clearing out the thin order book down to a single large BUY Limit order in the book at support. As it was so swift the exchange filled the order with the available liquidity. The only orders outstanding to complete the order were back at the original price before the selloff.