[ This obviously isn't an ordinary farm cow! It's a magical creature. Setsuna believes that it's an infant because of a number of its features, both physically and mentally. Regardless if he's wrong, it's still defenseless and requires careful attention. It's beneficial to regard it as an infant to best care for it. So he's thankful when the boy backs down.

And it seems that Setsuna's second guess is correct. The young man is indeed ignorant of the purpose of Carriers. He wonders if it's because he intentionally didn't listen to the armory staff or if said staff completely failed to educate him. In his case, he was properly informed when he first arrived. It doesn't matter either way; it wouldn't change anything even if he figured out who is at fault, so he'll simply extend his aid to fix the problem. ]

Yes, you are meant to care for it. Your Carrier is your responsibility. It will serve as your communications liaison in this world. It can access a magical network which connects other Carriers to each other.