This isn't the first time he's heard mention of multiple universes either, or alternate dimensions, although- "One of these days, someone is going to have to explain to me exactly how that all works."

Because he's genuinely interested. He's also a little concerned Billy's been to a real hell before. Then, he's reminded that Billy mentioned once being familiar with a hell lord. He supposes that would explain that bit.

His lips quirk with somewhat wry sympathy. "But yes, quite. Perhaps if we keep digging, we'll turn up some indication of what to believe, or at least... vaguely trust."