"Since Ceidary," he replies as if it's perfectly natural for him to use the local time keeping method. Sebastian has always had a knack for adapting and blending into a new society.

It's entirely possible that his name might've come up when Martha was brought on board as a good example of what magical injuries look like. McCoy gave him a physical and there are probably some bizarre records somewhere in the infirmary that list conditions like: marble knee (green, white veining), patch of owl feathers on back of left shoulder, extensive nerve damage, etc.

"And you? Please, have a seat, if you'd like."