The Importance of Night Vision

Fable and Argo go to Dr. Knox's office, but the door is locked with a skeleton key. The room houses two safes, one of which appears to have been forced and clawed open. Fable casts an investigation check: "What is the purpose? See if there's anything in it" She then releases him from Mage Hand so that he can't attack her again. He turns invisible; she uses magic lantern to see through his invisibilizer. But as they look into the other safe, something ignites within its chutes. They are able to dodge out of the way at the last minute and it strikes the wall opposite you.