Chapter 8 - Mole Temple - stuck after Laser barrier

[zaggynl]

No clue how to open this fence, I probably haven't killed every monster or so?
Can't find any to kill though..

Screenshots:

Fence in the distance:
http://img106.imageshack.us/img106/466/shot0000.jpg

Standing in the room of the fence:
http://img106.imageshack.us/img106/5333/shot0001.jpg

Objectives:
http://img17.imageshack.us/img17/9357/shot0006tcj.jpg

[zaggynl]

Resolved it by loading an earlier savegame, this time the "Fight the beasts" objective was completed, I'm unsure why it didn't before..