Remus, in his new found quest to get out of his bloody house more, was taking a walk around town. If the Order did reform it was only a matter of time before there will be patrols to walk, he may as well get to know the place better. It was quiet and he thought he'd heard voices earlier. He headed for the Quidditch pitch, not having been there before. It was there he heard voices again.
Drawing his wand, just to be safe, he sneaked around the newspaper building, looking for the source of the voice. He saw the girl tied to the tree first. Creeping around a bit, he tried to get a view of the person who had done this to her.