[2020] Why are the zombies bleeding to death?

Missing bits do not always and automatically mean you bleed to death.

Also, it's a game, not a medical simulation.

We want to have rather MORE cool effects like bleeding to flesh out weapons and perks, not less. =P

There are so many "zombie lores" out there that you only have to pick one that works.

Well, Thor has at one time traveled at multiple times the speed of light while Captain Marvel (whose power is some space light) can't even do light speed.

(keep in mind that digging too deep into comic book lore will get you into Arkham Asylum)

Cool. We have reached discussion level Banana.

Yup. That's banana level.

Magical zombie gue and tantric combat.