Lure the beast into running through ice shards to weaken him. When he stops, grab his tail and jiggle the stick to throw him off the plateau.
Act 2.2: Second door on the left; smash a barrel to find a hole in the wall. All Costumes: △, ○, △, □, □, □, L1 + L2 Level Select: △, ○, △, □, △, ○, L1 + R1
△, △, ○, ○, □, □, ○, ○, L1 + R1 + L2 + R2