Katsuya is going to have an interesting day indeed when he explains how large Blue Eyes actually looks when summoned outside the constraints of the train.

"Yeah, tha's my thinkin'. He tries t' stick 's head in everythin' too, so even jus' his head bein' out's no good."

Just as he says that, Red Eyes is moving their head over to sniff at Kaiba. Because of course they are.