penumbra black plague, help!

[someone972]

Here's a couple hints to get you started. They get more explicit as you go down, so you can try each one if you still want to try and figure it out yourself.

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You need to get him to stop chasing you somehow, can you trap him?

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Somewhere is a door that is activated by a button, not by pulling it like the others.

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The brightly lit room with a single pillar and lots of computer noises has the button next to it, lead him in there and trap him.