Ok, when Blade brings the girl from the hospital back to the wearhouse and the girl wakes up and finds Whistler injecting Blade with the serum, Blade is sitting in the chair holding hands with Whistler as he reacts to the serum. As Blade catches a glimpse of the girl, Whistler turns and sees her. There is a closeup of the two holding hands. Whistler moves away after the girl and then another closeup is given to Blade, who is still holding hands with Whistler even though he has already left to catch the girl. Just another slip-up or movie impossibility, if I may call it that.