I have a very fun theory that when the zombies zombie out they don’t lose control of themselves per-say. They just get very hyper off of the emotion they are feeling in the moment.
So when they feel in danger, or angry, or have the urge to protect someone, when they zombie out just amplifies those feelings.
For instance in the first movie when Zed corners Bucky, that wasn’t Zed just happening to find him, he was actively hunting Bucky down. When Zed Zombied out it amplified his anger towards Bucky.
My silly theory (which I don’t think is a theory) is supported by the other movies.














