"Ah. Well, no," Jack says, blinking owlishly at the teenaged Sephiroth. He takes in the appearance-- and the scent of him, too-- without reaction. His best friend is a giant tree-man and he regularly turns into a wolf monster. Weird pupils are nothing.

He offers, "I can guess it is a meter that reads multiple things? Or else it is something that is multiple meters long, but that doesn't seem as likely."

Jack himself? Looks very non-hostile. He's wearing a nice suit, color coordinated and well tailored, with shoes both comfortable and fashionable, and he holds himself like he basically lives off his charisma, not his muscles.