I know in movie Harry seen Peter in the hallway and wemtto find him. Them Peter being Scabbers ran in past him then he seen Snape on the map, and we all know what happened for anyone that seen that part in movie.

Was that part in book I don't remember? After I re-read HP&HBP I am going to read all of them all over again to see if I can find and see things I didn't the first time.