[THE BOW..... THE BOW!!! she sure is going to pick him up again, namely to hug him because that was adorable.]

Ahhh! Who's an adorable deadly dangerous robot! That's right, you are!

[... Okay, Ruby, focus. Right. Explanations. It makes sense when he explains it, really--when she thinks about it, she can see how it'd be both deadly, surprising and effective. So she smiles, a little bit more seriously, and--]

He's really cool, Hiro. You designed and built him really amazingly.