As anyone familiar with the 24 hours market cycle knows, this is THE WORST time of day for liquidity
(It improves from here as Tokyo, then Hong Kong and Singapore open)
What this means is that fear-driven moves can accelerate, and moves can be huge
Adam just posted on the No one knows what's happening in XIV and it's causing a panic
It looks to be an event isolated to that market (The fear is that it's going to be liquidated and go to zero ), as if it was a more widespread event it'd be showing up in FX. (ps. to the extent anything can be isolated to one market anymore that is)
But ... as Adam says, no one knows for sure.
For more on the XIV implosion: