And there's a nice real world test of this happening right now :) BTC is experiencing a flash crash. I've taken a screen shot that shows the effect on Alts (https://imgur.com/a/4vNOP). Almost everything is down but at the moment DASH is still in the green and EOS has only lost 2% (compared to others losing 12% or more).

Will be interesting to see if DASH stays green or starts to hit the red like everything else.