Jayce is glad she got the rest of the way with no trouble, it would've been a problem for everyone. Plus this is very impressive, he can't help but admire it. He is tall so he leans over and manages to slide the top ones off for her. This many are no struggle for him, but he is pretty sure he couldn't do all of them.

"You are extremely ambitious, Diana of Themyscira. I've never seen anyone carry that much and with such balance. It's amazing." Compliments come easily to him but there's a sincerity to them, that he's saying them off-the-cuff without any intention. "I'm Jayce Talis, of Piltover." Since that's how she introduced herself, he wants to mimic the style, it's polite.

"After you." He moves his head in the direction of the shopkeeper, despite now having a good number of them himself. Again, polite. "You probably saved them an hour of work." Going back and forth. They might have a cart, but putting them on and off the cart would take effort. An hour might not seem like much, but to someone with a lot of work, it adds up.