Trowa's (Havelock's) face says: yeah, I know. Without expression.

Trowa's (Havelock's) mouth, however, says: "Her world has a lot of magic." Much of it he doesn't care for at all. But. "She can undo things sometimes."

He's not certain. But Tutu seems pretty confident, so it might work, and in any case he judges that it's fairly unlikely to make things worse.