[ As big as a train? That's a reference Reiner can actually understand, having traveled by train more than once back home. He's suitably impressed, his surprise shifting to quiet awe, trying to imagine a train-sized sea serpent. (His mental image is probably way off, but it's still impressive!) ]

That's incredible, [ he says, his eyes still rather round. ] I wonder if it can still fit into one of those little balls…

[ Not that he understands how the little balls work, really. Magic seems like the only reasonable explanation—if it could be called "reasonable" at all.

He shakes off his musings to answer the question: ]

Oh, it's my given name. I didn't know how creative people could be with them. [ And he's yet to change it, even if "Armored" has a certain appeal. ] "Reiner."