Raiden's expression is one of calm concentration, he's not forcing things but he's taking the lesson quite seriously. He exhales and feels a warmth tingling his nerves. He focuses on it, and there's a weak little pop of static between two fingertips. He keeps his eyes closed but he can't help the faint smirk before he calms again. It's day one, so he probably won't get much further than this, but it feels good to have that sensation at his fingers.