Well. Finally had a chance to play the session. It went... interestingly. After luring the bandits outside by setting the stable on fire, the rogue snuck in to the great room, shoved all the bedding in the fire to light the place up. At this point the bandits were wandering back inside (no use fighting the fire in the stable at this point) and cried out in panic. Iozoze came in out of sight of the players hiding in the north woods, and put out the fire. The characters heard the noise of the icy breath and noticed the lack of burning down, and Izoze went to have an angry chat with Rorshak. At this point, the rogue snuck in to one of the bedrooms and started a second fire, while several other party members started firing arrows in through the window and then entering the great room (not realizing the rogue had set the second fire). Izoze came out in the commotion after a few bandits were felled, the fire spread quickly (had to make up a mechanic, just said once per round, each tile adjacent to the fire caught fire on a 4,5,or6 since it's all rather flammable). And with the place starting to burn down around them both the party and the bandits fled through different exits.
And then, at this point, I realize that right before the fire the rogue had snuck through the trophy room and aced a 29 perception check and I blanked and completly forgot to mention the trap door >.<. So at this point I feel the need to give them a fair chance at rescuing Lady Argentia but I just don't know what to do. They won't run through the fire I'm sure, so I'm thinking of maybe having a partial roof collapse drop enough snow to extinguish at least that half of the house? Any advice/ideas?