He can't help but smile back. It's a relief to know that it works, and more than that, that she's happy to have the new ability available to her.

"You heard that sound, right? That was the foam being produced. Here, check it out." He holds the hand out in front of her so that she can touch the drying armor layer. "This is the protective layer that it produces. It's requires more energy to use so you gotta be careful about it and there's no Converter Worm here to help with that."