Christof was still crouched by the door, waiting for his chance to spring either Oswin, Peyton, or Kenrick. His opportunity came when Oswin began marching up the stairs, leaving the brothers alone in the room. He was outnumbered 2-1, but the odds were greater in his favor than if Oswin had remained in the room. At the same time, a feeling of dread crept into his gut knowing that Jem was upstairs, and the thud had likely come from her and that other awful man... there wasn't anything he could do from the ground though, besides try and gain the upper hand on the main floor...