In this scene it shows Daniel trying to will HW to drink a glass of milk and whiskey so that he sleeps easier. Daniel is forceful with HW, despite not showing those signs earlier in the movie. He acts like this because in his mind he has the superior crutch in the form of his brother. Now that he has true blood to rely on he no longer has to rely on HW. HW senses this, and eventually rebels, burning Daniels house down.
