Actually you don't even have to do that. Get Phogoth to "see" you from the room [i]behind[/i] the Shrieker room. It's somewhat luck if he actually moves to do it, but you can tease him a little by poking your head out the door. He'll stay right there and keep firing, but the terrain stops his Void bolts from getting to you. Icebreaker, crouch/scope, shoot till empty, wait to reload and repeat. Shrieker/Wizards never even spawn, took about 8-10 minutes (might have been less).
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That's the room I was talking about.
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My bad!