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Ah so a very large buy must have spiked it up. Feel sorry for whoever paid those prices :)

I thought market depth must have been thin to let the price move so much so fast in both directions

It was a reversal sign, and I have since gone long regular BTC hoping that the price will start moving when Asia wakes up in a few hours and starts their trading week.

There are all kind of tactics that can be used to manipulate or drive if one has the capital to do it - not saying BCH was entirely manipulated, was exuberance as much as anything.

Buying above ask, selling below bid, spoofing, etc. all can make price defy gravity in either direction