I think the volume can be explained either by manipulation: Someone wanting to get in with larger volume at cheaper prices.
Or, someone taking some profits from earlier entries at the .05 level. Notice after the 2 Million share trades, it really did not move much after that. Another 100K traded after the 2 Million. That implies someone wanting to either take a position, or get out of a position at a manipulated way. I like to think that it was accumulation based on known information about an upcoming PR. We shall see.