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Extracted from the Behaviour section:

"Headcrab zombies have been seen in videos, running, rather than a stumbling walk. This could change the players actions on how to dispose of them, by changing the player's reaction time, on time point accuracy, and some fear towards them.[CITATION NEEDED]"

How do you got that conclusion? Which videos show that detail about the zombies? That part seems to be innacurate, so it was removed from the original article until we get the real conclusion about it.

The above observation is inaccurate. Headcrab zombies will behave like headcrab zombies, and walk at the same speed they always have. --Cman2k 18:39, 10 January 2010 (UTC)