Yesterday was a relentless trend day down on ES. On these kind of days levels usually offer either a weak bounce or gets cut through like a hot knife through butter. My theory is that 'normal trading' is suspended on these days and someone simply wants to sell, sell, sell.
On a day like yesterday the optimal trade is simply trend following, IMO. These straight trend days down are somewhat rare as far as I can see, but they do happen once in a while. We had one earlier this year and the last one prior to that November last year.
Most other days where we've had a large drop usually are usually countered by a strong counter move and even one that's bigger than the preceding drop. Think Tuesday.