It probably is a "mass panic" - market irrationality to use economist speak. Interestingly, though, Bytecoin is still climbing... Might be worth a punt. Poloniex is struggling with volumes, I think, as one of the most complete platforms it's getting overwhelmed as everyone in crytpo tries to take a position and/or hedge prior to any hard or soft forks in Bitcoin... Personally, I'm sitting on my coins and waiting to see what happens