This has already happened in reality with ETH on GDAX: https://www.google.com/amp/s/www.cnbc.com/amp/2017/06/22/ethereum-price-crash-10-cents-gdax-exchange-aft

This has already happened in reality with ETH on GDAX: https://www.google.com/amp/s/www.cnbc.com/amp/2017/06/22/ethereum-price-crash-10-cents-gdax-exchange-after-multimillion-dollar-trade.html https://www.google.com/amp/s/www.cnbc.com/amp/2017/06/22/eth...