Because even on Buffy Dracula is kinda his own thing. He obeys all of the rules of his vampireness and not the Buffyverse ones. Therefor because the blood exchange isn't necessarily a carried over thing it doesn't work with Dracula.
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Angelus wins this one Wolverines blades could only wound him
Angelus can drain his power by biting him too much speed and power
for wolverine
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Old ones are old, and new ones are 13.
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A lot of people say that the old ones are better, but I
personally like the new ones.