Check out here: Price Was Slump
This article has been covered numerous times and has spread all across social media. Here's an example of the same writing, but on a different site: https://www.marketwatch.com/story/anonymous-trader-buys-400-million-of-bitcoin-2018-02-16
I think this is just the ideal of buy low sell high. There's nothing stopping people from buying the dips. We (at least most of this forum) knew that bitcoin would rebound eventually, and this 400 million US dollar purchase has definitely impacted the market. The rebound has been intense, and I think there's more support to come. There may be a few corrections on the way, but I think we could be setting in on a new ATH later this year. Just have to see how the technology improves and what governments end up saying about bitcoin.