First of all, $1,600 USD difference drop is not considered crash yet, thats only 22% drop in percentage, there are higher percentage drop in history of Bitcoin that 22%. Two factors that you need to consider why it dropped 22%, one is the market correction because of the recent bull run, next is the orchestrated BCH pump. Blame those with weak hands for selling their BTCs in exchange for BCH and enjoy the short ride to the moon and back.