Merrill nodded, getting comfortable on the couch. "The ghost hasn't been back." That wasn't precisely what Hawke asked, but there were so many things on Merrill's mind lately, and it seemed her brain just wasn't big enough to handle them all. "I'm so glad you came, by the way. Even if Frodo was a little nervous."
For some reason 'Set it on fire' wasn't a natural instinct hobbits could understand very well.