I did notice that too. BTC and NEO were exactly a one on one reaction with each other. The only reason I can find is that BTC and all coins are to much related to each other. Not showing this while going up can only be explained because of the madness that went on. We all did buy a lot of shitty coins that gave us 200 to 6000% on profits. Even cryptokitties were sold over $ 100.000,--. That's absolutely total madness.