15. CHOICE: Cant kill spider demon

[rlbumich]

Hi all,

Need help killing spider demon in level 15. This is room where demon comes out of aquirium; and I am having hard time killing it. Any way to kill it? I 've just run around the conference room and shoot at it and after awhile I get nabbed:-x

[Sneaksie]

It heals itself by siphoning cold. If i remember correctly, you need to prevent that first (turning the valves perhaps)?