Here's what I am thinking. New Puts are now being written with vigor at 6300, but they are still 1/3 of Calls added at 6300. The build-up on both sides is slow, but if it continues, the key is to watch the Calls side. If there is a sudden spike in OI of 6300 Calls, then NF will likely have a BOF of HOD, for the quick move down to 6250. Anyway, don't expect 6300 to be broken with the current build-up.