Quote from Lawrence Chan:
MM bots try to guess (or using the "god feed" know for fact) and discover the orderflows.
i.e.
Front run mode - outside papers with large sell orders coming then front run them, vice versa.
Creation mode - counter day traders' positions as stop levels are very close, to create possible liquidity at the other end.
But lately, something interesting happened - when the HFT orders pile in to shoot thru multiple levels, someone step in to counter them with similar size at a price point than the bots cannot unload with a profit. Forcing them to puke.

Quote from oraclewizard77:
By the way, using higher mathematics invented by an important person which was programed into my charts, the price of 1015.50 was an extremely reliable sell signal.
So you ask, if this was the case, why did I sell the 1st contract at 1013. I did in fact have another sell signal at that level, however, I now see that I got in too late for a scalp.