Let me exlain this situation because we have a lot to say : I'm very disapointed by COINBASE because this was all orchestrated.
In fact they decided to announce BCH trading in the middle of a BTC difficulty adjustement (they could have waited a bit), and during a moment of BTC weakness (dumping wise) (They just made the dip to be panic sold).
Then obviously, BCH pumped super hard because of BTC dumping as it is used to be a hedge sometimes to BTC .
Then I reckon insider trading or roger and big whales dumped all their BCH on the crowd and rekt everybody.
BTC TA wise : We made a clear on 15mns, divergences momentum + , I think we are heading back up now, BTC still in uptrend. Never panic sell or you will just do a giveaway of your precious BTC