The idea of explosives was Harrot's not Hopla's, so I hesitate to post IC Hopla saying someone should go to the quartermaster. But someone besides Hopla should take on that task, someone with persuasion. The quartermaster may be inclined to help us anyway.
Tavitha seems to me like a good choice (assuming she has appropriate skill...). Would give her a chance to leave the room before she pistol-whips Khen. I can post this IC, but again, would have to fudge a bit.