Holiday werewolves: ever considered getting drunk cheap by drinking all the blood of someone who’s BEEN drinking?
It won’t work.
Adult blood volume is about five liters/5000 ml.
A blood alcohol content of 0.10 percent would be… 5 ml of pure alcohol.
Which would be the equivalent of 12.5 ml of 80 proof booze of your choice; about 0.44 fluid ounces, or less than a third of a shot.
So even if you, a werewolf, drank ALL your victim’s 80 proof rum-infused blood, it would barely register. Not a good life choice, werewolf.
(So, you’ll never see a werewolf in one of my stories making THAT mistake!)