All has to due with the zombies beginning to rot. We are now at least 2 years into the Zombie Apocalypse, with most of the population turning within the first month. So most zombies have been slowly rotting over those 2 years. Makes sense that the zombies need to grab to be able to bite now.
I also think I'm done with the Talking Dead now. They all but gave away who lives and dies in the next episode. If they can't do a live show without giving away critical spoilers, then they shouldn't.
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