Iv'e been watching the after hours trade log and what seemed to be an everyday occurance while the stock was going lower were some large VWAP trades. Now I havn't seen any since the price action has reveresed. Whats up with that ?

Could it be th MM just keeping trading smooth ? I doubt that. Or could he/she be moving it at the behest of or in coordination with others?

Just how much power does the MM have? I have to admit it all seems like smoke and miirors to me. Is there a good book or article I can read ?