Jack hatches a plan, and sets to work...
Patlin, here's Jack's idea... First, he'll use his dagger to cut his cloak into pieces -- six thin strips and two large halves. He's going to soak one large half in oil, and leave it spread out on the roof. He'll then climb back down on the side he came up, soak the second large half in oil, and leave it jammed up agains the base of the wall. Finally, he'll retreat back out toward the nearest campfire, where he'll soak the remaining six strips of cloth in oil and tie them around six of his arrows. Once those preparations are complete, he'll hide out near the fire, where he can quickly light his makeshift firearrows and shoot them into the oil-soaked cloak halves, when the opportunity presents itself. Mind you, as usual, he'll be as stealthy as possible all the while.
If circumstances change in the midst of the operation, Jack will re-evaluate the plan, before he continues.