Kaiba immediately casts a spell to summon his pile back to him. He's practiced enough at this that they land neatly for once, and he can focus on glaring at this person.

"That was clearly the edge, and you're clearly not watching your step," Kaiba points out, disgusted in the moment...but intrigued about the device. "But people having their nose up their tablets is novel for this place...hee, it's usually books."