The Secret Passageway
Crabbe levitates s-l-s-l-l-s-l-l-l-s-l
Goyle levitates s-l-s-l-l-s-l-l-l-s-l-l
Hermione slides s-l-s-l-l-s-l-l-l-s-l-l-s
Ron levitates s-l-s-l-l-s-l-l-l-s-l-l-s-l
Goyle slides s-l-s-l-l-s-l-l-l-s-l-l-s-l-s
Notes:
Goyle is the last to move. Notice the pattern of slides and levitates.
The total number of moves was 15. There were 6 slides and 9 levitations.