I don't trade the ES, I just read blogs of ES traders and paper trade it for fun. I've been observing the "personality" of ES and noticing how it changes on some days vs. other days, and I noticed that sometimes (on the tape) there'll be a large trade (or set of trades) one way, followed by a sudden reversal the other way with even more (2x) volume, and that these reversals happen more frequently on some days than others. And if I were to venture a guess on when it happens most, it's on days where the market trends more. Again, I don't trade the ES, but I watch it. However, my data quality isn't so great. Can someone who looks more closely at ES tell me what exactly is happening? Is it likely just two different players battling it out, or someone trying to sucker small traders into a trap and then punch them all in the face? Are my observations just illusions from having a crappy data program, or is this real?