Visible crew/equipment: During the final battle, a vampire shoots into a totally dark room and kills a werewolf. He then lifts his gun and people are seen reflected in the sights. (01:37:05)

Underworld (2003)
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Directed by: Len Wiseman
Starring: Bill Nighy, Kate Beckinsale, Michael Sheen, Scott Speedman, Sophia Myles, Shane Brolly, Erwin Leder
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Michael Corvin: I want to stay with you.
Trivia: The plot was supposedly loosely based on Shakespeare's "Romeo and Juliet."
Question: Can anyone explain Lucian's arm blade? It seems totally out of character for him, and every time he changed to wolf form he'd have to track it down and reattach it. Moreover, since these vampires don't have any weakness to metal, there's no special advantage in using a metal blade instead of his wolf claws. So what's the point?
Answer: Removal of the head kills everything. Immortal or not. At least that's what I saw.
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Chosen answer: In most of the shots, Lucien takes his coat off when he changes to wolf form, and the blade would be attatched to a mechanism in him coat. Also, the film gives us an example of the blade hurting a vampire: bloodloss. And that kind of weapon could do some serious damage, and as it probably wouldn't kill the vampires, it would almost definitely slow them down.