Reaven carefully slinks into the room while Cassie comes barreling in with a full head of steam, all the while yelling Dwarven battle cries. Once here you'd ascertain the room to look like a warehouse of sorts with all manner of differing sizes of crates. You'd think this was used to store supplies when the Mine was more active.
With the sound of a trigger being squeezed a crossbow bolt comes barreling towards the fleet-of-foot swordsman!
Spoiler: Rolls
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I'm gonna rule you're flat-footed for this attack as you don't know where the attacker is coming from. (1d20+4)[20] if hit (concealment roll) (1d100)[1] (1-20 is miss). If attack is true, then (1d12)[10] + (2d6)[8] SA damage.
With the narrow miss, you hear the sound of a curse word in Orcish.
The room is 20 ft deep (from Reaven to the wall) and 20 ft wide. After the shot fired, it would appear the bolt came from the barrels. Cassie, Syviraux, & Reaven are up again.