Thanks to BTCUSD strong fight, it will retest the downtren again and we will se if its a fail breakout or not.
As you can see, when BTC slowly go down for a day or two, not a straight dump, people will lose patient and eventually FOMO sell their alt coins first, hence the price go down and BTC.Dominance goes up, thats the effective shaking, much more than the dump which mostly catch stop losses.