Remus was looking at the Marauder's map when he spotted a name that should not be there. "Peter..." He said before running out completely ignoring the Wolfsbane potion and the time. He had to do something, Peter was dead, but dead people can't be at Hogwarts.
He had to find out what was going on, he ran as quick as he could to the Whomping willow, made his way thought the tunnel and into the shack he had spent so much time as a boy. When he entered the room he couldn't believe his eyes and before he thought about it he stopped Harry from using magic on Sirius.