When Mulgarath chases you, run toward the kitchen and use the dumbwaiter. Hit any chairs that are in you way with your bat. Once you start going up, Mulgarath will transform into a snake and chase you. When you reach the study, three Goblins will try to attack you. Ignore them and continue on. The other side of the study will be blocked by furniture. Climb over the large bookcase and continue running. The snake will catch you, but Thimbletack attacks it so that you can get out the window. Jump to the other ledge and climb up the roof. When you reach the top, run to the ladder and start climbing. A clip from the movie will appear and Mulgarath ends up getting eaten by Hogsqueal.