I have no idea what is on the minds of the scattered named sellers. The big methodical buyer is TD. The broker handling the size order must have been in the can when it traded down to .77 earlier. When he reappeared, he had to get it back up. The last I saw was .84-.85.
On the preopening a .85 buyer for 3,500 showed up and was accomodated by TD. It looks to be that the order in the broker's pocket is for real big size just above the .80 level with a possible top today in the mid-.80's.
JMHO