Well, they're in the dreaming, so he could make a dead butler disappear as well. (Or concoct a fun murder mystery where they follow clues, that's also possible. And sounds pretty fun, actually.)

He could also make her pain actually affect her real body (it's funny how the mind can make the body react even if it didn't actually receive the original stimulus) and give her a burn, but that's a technique he almost never uses. And if it does, it's to do the opposite thing - heal rather than hurt. There are very few people he dislikes strongly enough to hurt for no good reason.

Topher takes her hand in his - mostly a symbolic gesture, really, and just a way for him to focus more easily on the part of her that's hurting, even if it's all imagined - and he soothes the pain, removing the imagined damage.