Blade: You better wake up. The world you live in is just a sugar coated topping. There is another world beneath it. The real world. And if you want to survive it, you better learn to pull the trigger.
Security Guard in Hospital: Freeze!
[Shoots at Wesley Snipes.]
Blade: Motherfucker, are you out of your damn mind?
Karen: Why do you hunt them?
Whistler: I had a family once. A wife and two daughters. Then a drifter came calling one evening. A vampire. He toyed with them at first. Tried to make me decide which order they'd die in.
Dr. Karen Jenson: You have a lot of love for him, don't you?
Blade: We have a good arrangement. He makes the weapons. I use them.
Whistler: Catch you fuckers at a bad time?
Karen: You're one of them, aren't you?
Blade: No. I'm something else.
Frost: Easy! Wouldn't want our little friend here to wind up on the back of a milk carton now, would we?
Whistler: Some of the legends are true though. Vampires are severely allergic to silver. Feed them garlic, and they go into anaphylactic shock. Then, of course, there's always sunlight, ultraviolet rays.
[Whistler turns on a weapon that produces ultraviolet light and points it at Blade's face.]
Whistler: I got this sucker running. You want to give it a try tonight?
[Blade takes the weapon from Whistler.]
Blade: It's still heavy.
Whistler: Well, you're so big.
Answer: I don't think it's so much a memory as it is Blade just equating Karen with his mother in that moment. The only way to convey his thought process to the audience, though, is to show his mother onscreen.
Phaneron