  Harry decided to go alone to the Infirmary. He saw that the Potters and Blacks and Lupins, were all outside the room. Luckily Harry managed to slip in when a third year Slytherin came in the get checked by Madam Pomfrey. Inside he waited until Dumbledore walked in as Daniel roused. The old coot was most likely waiting at the door and just wanted to have a meaningful entrance.