Mcgonagall picked back up in the commentary, speaking with a matter-of-fact tone. "Once the lightning appears in the sky, you will need to go to the place where the phial’s are hidden, you will see a small mouthful of blood red potion inside each one. Here we will escort you all to the room of requirement where you will attempt to transform. If successful you will feel a double heartbeat in your chest, the pain of transformation at first is excruciating but then you will see a form becoming clearer in your mind. You mustn't show fear, it is too late now to go back, you must push past the limits." 