I would guess we test the prior month high / close (5767 / 5762) on this leg down. EDIT: Those numbers are for SPX by the way.
Very clean down move so far. Coming into some possible support levels in this area, but I'm not so sure we'll see much of a retracement today to be honest. Could easily continue lower into the Close.
That 5400 area looks like a good target if this move lower has legs over the coming days. 5410 was last month's low and the 200 day will be pulled up to around that level as the days progress.