"I believe in magic well enough, monsieur, but that does not prevent me from thinking it absurd."

Nothing makes sense in his life anymore. Why not? Javert has just come to accept it. Stone brings up yet another point that should be addressed, though, and so Javert continues, arms folded across his chest,

"Let us say that this works. We find a way to keep them out. What, then, is there to stop them from crawling into our minds again? Is there a spell to prevent that as well?"