I'm wondering about that too. It could be a warning of some kind or a possible red herring planted by the Puppetmaster. Either way, it's still really weird why someone would leave behind a "Don't leave this place" message when being locked up in a school against your will or have people kill in order to leave, while both the innocent and guilty party are at the risk of death, isn't necessarily the better option or the lesser of the two evils.
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