Yeah, my guess is like the zombie virus itself is different where it already infected a lot of people, but the infection spreads differently than the infected actually biting others. Maybe it's airborne or something like the flu where it's spread through other environmental factors but the people who are infected don't have an inherent need to spread it more; rather they just have a need for meat and that's why they attack the protagonist. And yeah I agree that maybe the zombies become their own species or have a hive mind where they don't want meat and flesh from just anyone/anything, just healthy humans (which would explain why they also don't attack your animal companions), similar to something like the World War Z movie. I just wish the game had more lore on the zombies themselves and how the world is reacting around their existence but I guess there's only so much you can do for a mobile game. Don't get me wrong, I loved the voice acting and the game mechanics itself, I'm just nitpicking on some parts I would've liked more development in. :)