It could be a confluence of things. I do think Bitcoin does tend to lead the stock market by a few months. Rightly or wrongly, it is a great proxy for global liquidity and risk sentiment.

That being said I think the surprise ETH etf approval and now the surprise timing of the Mt Gox distributions (was supposed to be October) plus the fed being a bit more hawkish than expected last meeting has more to do with the pullback, at very least the recent segment of it.