In his twisted crusade to infect more wizards, muggles, and squibs with lycanthropy, Fenrir overhears rumours and scuttlebutt from various muggles about a strange family in an isolated farmhouse.

Presuming that the 'oddness' described are from a wizarding family laying low and thinking that wizarding-werewolves would be better than muggle ones, he switches targets and heads out towards the farmhouse with his group.

After finding it and seeing the family inside (including a younger son and daughter), they settle in nearby and await the full moon.

The moon rises, and it quickly turns into a nightmare -- but not for the "victims".

Greyback and his group quickly find themselves on the run, trapped in their cursed shapes until the sun rises as they're hunted down by a pack of creature more vicious, more hardy, and far more brutal than they are.

And they're not only hungry, they're pissed that competing "werewolves" are trying to move in on their territory...

Harry Potter/Dog Soldiers.

https://www.youtube.com/watch?v=oYIUS1yeNAQ

https://www.youtube.com/watch?v=zIud5J4nAO4