How do you get past chpt 11 in golden compass ds

well, how do you get past chapter 9.1??? I've been stuck on it for weeks. It's driving me mad!!! I can't get Lyra to jump over the roof when she's on the roof near the beginning. what i need is a walk through for that level!!

anser: all you do is get the poler bear to slam at the wall
it will break the wall and you go in there and fight the enemy's