Heh, happy that so many people are playing my hold...
×1.
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×What I did was, head to one of the force arrow tokens, all the while avoiding the slayer.
2.
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×Then, by the time I left, the wisp found me but he was nowhere near me so I could leave.
3.
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×If some roaches come out after you, just deal with them while moving forward.
4.
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×To lose the trail of the Slayer, move near him. He will be forced to turn to face you, and when he turns the wisp doesn't move.
It's based on the same trick of slayer movement in that one room in TCB.
Hope this helps.