Assuming he knocked, soon enough Loki would be able to hear someone come down the stairs and swing open the door.

"Hey, c'mon in. Shoes off, eh?" Narrow staircase leads up into a large well-lit room with heavy curtains and walls lined with jars of herbs, bones, oils, and other ritual items. Adding to the homey appearance, a worn rug covers the wooden floor, with a few tarps and more medical looking items off to the side.