Loki had need of services, the sort of services that required craftsmen. His house was hideous and he required custom pieces be made that would solve this problem for him. Unfortunately, he had already hired a staggering number of the craftsmen in Kirkwall and was running low on options. So that is what found him outside the forge of one of the rifters--and he knew it belonged to a rifter because everyone had told him to stay far, far away from it, because it belonged to a demon.

He knocked, rapped with some polite authority, and waited for a slave to come and open the door and greet him. When nothing happened, even after several seconds, he knocked again. More firmly. Eventually he was left simply pounding on the door.