I would see it as the other way around. An astute trader would have risk control in place and either reverse their position or stand aside. The investor on the other hand will bury his head in the sand and spout platitutes such as staying the course and long term investment.
I can see a repeat of last Sunday's Globex session gap up into Monday RTH closing higher. Tuesday flattish into Wednesday FOMC then down because the Street is not listening to Jerome - which I think he will stress although not in those words of course. Or not.