As they emerged from the base of the ground of the Willow, they saw Lupin make the final changes of his transformation into lycanthropy and Sirius transforming into his animagus form as well to lunge at Remus. Severus and Hermione both run in front of a scared Harry and shaking Ron who was once again holding Peter Pettigrew in his rat form, all the while Hermione could feel Severus shaking as his wand lifted and sent a nonverbal sleeping charm at Remus, causing Sirius to whimper slightly and turn to Severus with his mouth foaming, thinking he had caused harm to his best friend. He lunged, and Hermione stepped in the way at the shocked gasps of the two boys behind her, only to get bitten on the thigh and knocked back into Severus who held her up as everything went dark.