Continuity mistake: When Blade gets his serum, Whistler holds his hand, then they see the girl run. In one shot, Whistler goes right, leaving the suffering Blade. In the next shot (close up on Blade), you can see that Whistler is still holding Blade's hand. (00:26:57)
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Blade (1998)
Ending / spoiler
Directed by: Stephen Norrington
Starring: Wesley Snipes, Kris Kristofferson, Stephen Dorff
Blade's mother is still alive, and Deacon Frost is the one that bit her. Frost turns into a Blood God. Blade kills his mother and regains his strength by sucking blood from Karen and uses the blue serum to destroy Frost. The film ends with Blade in Russia.
Space Moose
Security Guard in Hospital: Freeze!
[Shoots at Wesley Snipes.]
Blade: Motherfucker, are you out of your damn mind?
Trivia: The original Marvel Comics' Blade was a member of a band of vampire hunters, who mainly fought Dracula (who also was a regular at Marvel). The others included Quincy Harker and Rachel van Helsing (both descendents of Dracula's enemies from Bram Stoker's novel), and Hannibal King (a vampire detective, and a victim of the original Deacon Frost).
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Chosen answer: It would seem Deacon has gathered a lot of strength around himself, in followers of "young" vampires like himself. After he kills Gitano he just abducts all the vampire elders, showing his followers are a lot stronger than the elders are. So they probably couldn't have killed him even if they wanted to, not unless they want to unleash a war. They thought his pursuit of the vampire god was totally pointless, so they let him waste his time and were probably trying to find a way to get rid of him.
lionhead