Sam held the sword out in front of him, hoping to at least get in the first strike against the gigantic beast barreling towards him, but at the last moment his arm wavered, the wolf knocked his sword away with a single sweep of an arm, and tackled him to the ground, sharp teeth and claws tearing into him and shredding away his clothes. Between the unimaginable pain and blood loss, Sam passed out, believing this would be the end.
He didn't really fully come to, first came more pain, as his body stitched itself together, shifting, taking on a new form. Then anger, hunger, a sense of power, running amongst the trees, snatching up prey, howling at the moon, running, hunting...
When he truly came to his senses, Sam was lying in a ditch, deep within the woods. His injuries were all completely healed, but there was no sign of either his clothing or his sword. He stood up and looked around, truly unsure what to do.