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There are three in-game files that are still in the game folders that relate to this potential Killer, the Trapple, Detention and Underperform. It is suspected that those files were added by the developers on purpose, fuelling speculations and rumours.
The Teacher's potential background is unknown.
The Teacher would have been armed with a Ruler that had a blade attached to it.
The Teacher would have used a Power called Detention. Its effects are unknown.
There is one known Perk that would have belonged to The Teacher: