Okay, let's start with a proof that it really happened because I can't see it. If we look at today's price dynamics on coinmarketcap, it seems that Bitcoin did not have any changes above around 2% from today's maximum price. I also don't see a 7% drop yesterday even within the whole day, whereas you're talking about minutes.
It's because there are lots of marketcap website and price indicator besides cmc. Possible that the op used different site or exchange with different rates.