@f0xhunt
Well, I'd say Phos' thinking is that if he gets Sensei to work and thus make the Moon Bois go away, at least more gems won't have to be lost.
Though he doesn't know Sensei's motivation for not praying right now, so there's also that. Maybe if he had learned it at this point, things might've turned out differently. Hell, Phos makes bad decisions (notice how I don't say "stupid") every couple of chapters these days. Can't blame him though, he isn't mentally great since that winter
Sensei seems to know phos is a enemy from the way he acted in this chap towards her, but why does he push her away saying he doesn't care where she learned his secrets. He is basically asking for trouble