One interesting point is the rally in U.S. shares yesterday happened after Europe closed way down. So while the U.S. is basically giving back a bit of yesterday. Europe never had any gains to give back, and indeed had sharp losses.
The correlations by which the vast majority of asset allocation and trading are done must have been thrown way off by this. I would think at some point, Europe is going to be a massive buy either outright or against the U.S.
If the U.S. can stay down for the rest of the day, I may be buying some EWI, EWG, EWQ ... before the close.
FWIW, I'm sniffing a rally in U.S. shares this afternoon, not on yesterday's scale, but a rally to more moderate losses.