I still don't think werewolves are immortal in beast form because that would mean the only way they could die was if they get killed by a group of people.
And how can you say that movie is the best this summer with movies like The Amazing Spider-man and The Dark Knight Rises coming this summer. I am not a fan of movies like that too because they are too kiddie for me.
"One of my favorite movies to come out this summer" is the operative phrase. I haven't seen the Amazing Spiderman yet, but I'm looking forward to it.
I'm an animation junkie, and so a film like that (which is mostly pretty mature. The comedy in the trailer isn't indicative of the film's tone at all. There is much more drama than comedy really) with such beautiful visuals (particularly the hair) and a pretty great story is a joy for me. Though The Dark Knight Rises is expected to be at the top of my summer films list right now.
Back on topic though: the fact that they'd only die if killed by predators (either other werecreatures or people) I think would fit Hircine's style, because that means his creatures have to be hunted to be destroyed in their beastforms. And if he ever really wanted to get a particular werecreature's soul to serve him in death that was in a transformed state all the time, I'd wager he'd either put a hit out on the beast for his hunters to gain his favor, or find a way to get the job done himself.