The sledgehammer version of finding out whether you're telling the truth or not.

[Douman sighs and shifts a little, pushing one leg forward so that he can rest his hands and upper body against the propped up knee of the other. He doesn't bother to hide his frustration.]

Simply put, I took out your battery to see if that'd make the bothering lights go out. It didn't. That means you're not the culprit. [It sounds flippant, but that's pretty much what he did. Trap realms and spells feed off the spirit energy of the one who casts them. The base principle of an exorcism is to drain the target of their spirit powers to the point where they'll be unable to keep up whatever magics they're doing or have become uninhabitable barren land to whatever supernatural entity had latched onto them, thus forcing it out. Knocking the caster out via a powerful exorcism could even break a Medusa's petrification, so using it to knock Morph out and see if doing so would cause any notable change in the world around them felt like a reliable test.] You should make a full recovery after getting some rest.