"Because it's something to do. A way to train your skills against opponents a bit more intelligent than the vermin the Door spits out at us. And it's fun!"

And what were the other reasons Alice had come up with? She can't recall. Doesn't really care. Entertainment is her main rationale, but if they want to use it as a chance to train and improve for some potential fight against the Null, that's fine too. And like Law had said, it gives the rest of them a chance to see what the others can do. Probably useful if they ever need to collaborate, or alternatively to defend themselves.

Whoever this woman is, she doesn't look much like a fighter, admittedly, but Caedra knows better than to judge solely on appearance. Power comes in all sorts of forms.