"Yeah, and I bet pretty much all of the Undertown is like that. That's where you wanna go for all the supernatural and magic stuff."

Not his style, really. He'll always prefer science over magic, but still. He can recognise Undertown's qualities for those that need it. Plus he can get alchemy supplies he's more used to there. He'd definitely understand suddenly being dragged into magical nonsense. His own life was relatively free of it before he met Rapunzel.