the bitcoin price was not exactly rising fast, it was coming back to where it was supposed to be and that come back was fast. the issue is that they keep repeating "bitcoin is a bubble" that you start to believe it, but when you check the reality you can see there has never been such a thing as a bubble in bitcoin.

that means the drop was an artificial lower price and against the demand, and when you go against the market you can not keep it that way. it will "jump" back up fast.