All you have to do is wait In the room and he will come to you just look at the names of the enemy and make sure he doesn't de spawn
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You are wrong. You must kill the 5 waves of troops before his drop ship arrives. Then killing him is a problem
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By "wait in the room" you mean the hallway with the shrieker, yes?
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The shrieked de spawns after not that long all you have to do is be behind it