Stepping around the chest of drawers that he had decided would make a nice obstacle in a firefight, Rabastan walked towards the bed and cast avada kedavra at one of the human-shaped forms. A pale green light flashed from the end of his wand and hit one of the sleeping forms. Proceeding to the other side where he nearly tripped over a tall pile of robes, Rabastan steadied himself with his shoulder on the wall before quickly sending another killing curse at the second lifeform. He rapidly cast lumos by which he ensured that both Marchwood and his wife were in fact dead.
Satisfied at his results, he left the room and headed back for the landing where he had split from Severus. Avoiding the counter unit, he glanced downstairs and decided to stop at the landng below the stairs. Arriving there, he waited for Severus who no doubt would be coming back any moment now.