Emily saw Torren's eagerness to burn stuff, and blushed slightly. It would be awkward to tell him the truth, but if she didn't then it would lead to more awkwardness down the line. 
"Nothing. I, don't know why he said to bring you along, but if my endevours are to suceed, I need you not to burn anything. You may draw energy from the fire if the Kitsune responds, but I don't know how Muspelheim fire behaves in relation to normal fire. It could just as easily cause you pain, or the Kitsune could take you as part of the Gift. If the Kitsune does come, you could probably ask her to set you on fire, that'd do something. But, until it does, or doesn't work, then I need you to...not burn anything"

Emily wasn't sure how Torrens was going to take this news, but hoped it would be well. Or, at very least well enough to not go setting fire to things she needed without good reason.