"It's someplace that's been pulling in people from different universes and times." He surveys her for a moment to work out when she was from. "Looks like you're from a bit earlier than I am. The residents don't entirely know why they've been getting to have an influx of new people. The people in the castle might know, but they stay holed up in there pretty much."

"As for me..." He shrugs. "Got grabbed while buying the Winchesters time to get the hell away from Lucifer. Rather good timing, actually."

Considering he would have been dead otherwise. Hurry for inter-dimensional kidnapping.