Back when the prices were $7 I was able to move the market $1 just by buying 200 coins at the right time. No surprise here
you just have to wait for the right moment. If I had done it when a 500 btc ask was clogging the line it wouldn't have worked. Then again, one dark order could have wreck the whole thing too. It wouldn't have been much of a problem, I still would have made money, the market just wouldn't have moved.