There's no sense in putting yourself in danger to help others when others with better-suited abilities were on the case, too.

[ She knows she doesn't have to tell him this, but her words are offered in assent more than anything else as she also offers a nod of thanks for the cup of tea. She skips on the sugar, but she does add just a splash of milk. ]

Come to think of it, Satoru mentioned having dealt with lava before. Perhaps you've had the same?