Its becoming very confusing what is going on actually, there are altcoins that is having a bullrun while most are doing its own correction and BTC is also dipping. But then altcoins aren't going very deep since this correction seen the reaction of BTC being dumped. When BTC rises again, altcoins will also go up just as how they did. The flow of volume is so huge though.
That's not exactly how it works. Altcoins rise when Bitcoin's dominance falls. Because all the money flows from bitcoin to other coins. Accordingly, when money is poured back into bitcoin, altcoins either slow down growth or fall due to large sales