at this time, we have a perfect exemple...btc up/alt down
It is a normal see-saw effect between Bitcoin and Altcoin, though this is a good time to be accumulating any coins one is interested in buying at discount especially most of the ICOs one missed out on, just look at Status it has not more than 70% of its ICO price in BTC
This is actually the advantage on buying more big discounted coins as of now on ICO. The sudden price increase did really give some beneficial to investors and regarding on altcoins its normal to see a sea of reds
Why people do still keep asking such thing since we have been experiencing this thing for how many times already specially if theres an event happening on bitcoin.