 The scene where Karen and Deacon are talking about the cure for  vampirism initially ran a bit longer and answered the question of  how the vampires would feed if everybody was turned into a vampire.  They would keep some humans alive in giant blood bags to harvest  them. The bags can still be seen in a doorway during the scene, and  later played an integral part of the plot in  _Blade: Trinity (2004)_ (qv)