The guardian was giving a bow of their head before they were gliding over to where Fenrir had been standing, where a small part of his spirit seemed to linger even though time had been reversed. A way of him saying that he also had a story to tell, even though they knew it wasn't his fault completely. Upon touching that small sliver they were able to see what happened to the poor hound. They had both been out playing when they had been attacked by somebody, although Fenrir had gotten in the way of Cerberus, who was "younger", so that the other hound didn't get hurt. This caused anger at what had happened and Fenrir went after the person who had attacked them, who ended up fleeing into the school - and everything went downhill from there.