Does Walter Have a Heart?
Walter claims at the end of the episode that the heart is just a "circulatory muscle." But when it came time to erace Toby's white board "Walter Likes Paige" formula, he just couldn't do it. Maybe one day he'll admit his feelings for Paige.
Now that you have a clearer sense of exactly what happened, watch the episode again and you'll see why it was totally a game-changer.