Bitcoin drops 300 points in 3 minutes, insider trading at Goldman?

Bitcoin dropped 300 points in three minutes this morning on the news that Goldman Sachs is for now, not going to open up a Bitcoin trading desk. This sudden and fast drop-off right when the news(or even before the news) was announced signals to me that there may be some insider trading of Bitcoin at the major banks(like Goldman) or perhaps price manipulations via futures at Bitmex to cause such a cliff. High level people at Goldman and perhaps other banks probably knew about this decision well in advance of the announcement and perhaps took the time to short or sell their bitcoin en mass right when or right before this announcement happened before anyone else had a chance to react. If the SEC wants to investigate insider trading, this is the place and time to do it.