Grogu isn't advanced enough to use a lightsaber, yet. Watching the show, however, he really wishes he was. He finds a good place to sit and watch, eyes wide as the duelists fly across the grounds, sabers flashing.

As he watches, he's floating a silver ball above his hands. He's got to work on his endurance, somehow, or he'll never be able to do any of that cool stuff. So, he's practicing.