Dealer Gamma for the S&P 500 still remains positive but slowly decreasing in notional value from 3.5B per 1 point move, down to 1.5B per 1 point move.
The Ichan 4050P this week was front running at its finest.
Now what happens is Puts get sold at this level. Ichan cleans up and everyone gets sideways Chop until the 14th.