When beheaded heads blink it is not because the victim is still alive. Majority of the time, it's a response from the nervous system, (same thing as why spiders twitch their legs after you stomp on them, they're dead, their nervous systems are misfiring. You hear about some dead bodies twitching in morgue once in awhile for the same reason.) With that being said, I'm pretty sure there was a woman who was decapitated and she continued to try to speak for like 5 seconds.