Severus was watching Harry like a hawk during their following potions lesson. He was looking for any excuse to have him stay behind. However, Hermione, Ron and Harry worked seamlessly together, despite their teacher having separated them at the beginning of the lesson. Once the potions were corked and labelled, Harry made sure that he was the last student to hand over the vial. He looked at his teacher with cold eyes. Then he wordlessly left the room.