I believe that damage to the "higher" brain my cause death, but if the damage is minor, that woud cause the 'twitchers" in the new dawn of the dead.
One assumption i have made in the "fast vs slow" debate is as follows:
they Can be fast, but only for a limited amount of time. the first couple of days after death, the body would still be mostly intact, and real decomposition would not have started quite yet, makingit perfectly plausible for them to sprint. however, it would be a temporary condition that would deteriorate over time.
that being said, i still prefer the slow ones as well. ill leave my speedy "zombies" as infected, but still living, humans, thank you :D
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