@Wildstag why would he, she's basically a criminal who's been beating up people left and right (maybe killing some, who knows), that's her only goal. Maybe he'll manage to beat some sense into her.
@Notesha I may be wrong because it's been ages since I read it, but didn't his powers activate when he needs to protecc someone? In that case, short of throwing them in front of a goblin king, taking them along would be the logical choice.
@ichibaka you can see mini-Tomoe putting a water barrier on the ring as it starts to explode here
@CinderKin that is exactly what he did, yes :)
@Loli_Omamoritai but he *is* an amateur. Tomoe gave up and he got badly hurt in his fight with Mio (also, she stopped). He has no battle experience...