What I don't understand is how the zombies in riot gear are even there in the first place.
You are prison guard in riot gear trapped in a prison full of zombies. How does one get infected and turn to zombie without the zombie devouring your entire body? We saw what a group of zombies did to Otis. They ate every bit of him and tore his body apart. I would think that a group of zombies would have figured out how to roll the guard over to find the exposed neck area to bite his head off.
There must have been something else going on to infect everyone, then something that caused widespread death and reanimation into zombies.
I can't see how a prison full of people can get all scratched and bit. What I would think would happen is that there would be a small outbreak, maybe a dozen or so get infected. That group would then go on rampage devouring each victim. I can't see them biting a victim and then letting them just run away.
Who says it was a zombie bite? They showed end of last season, that everyone is infected (disease is airbourne). When you die, reguardless HOW you die, you come back, if your able to (head not blown off etc.)
They could have died by natural causes, like a heart attack from being scared. Or maybe they starved/dehydrated to death because they were hiding. I mean where they are now, the outbreak has been going for a botu a year "in show time", so plenty of ways to naturally die.
The real question is, are the zombie bites also carrying the infection, or is it possible their bites kill a person eventually, by some lethal venom like disease? And thus turn because they are infected from the airbourne versions?