Trivia: When Joshua calls the KSI technician to ask what the blast range of the Seed is, the technician's ringtone is the Transformers theme song.
Trivia: One of the KSI Transformer prototypes transforms into a Cadillac Cien, which is the same car Tom Lincoln drove in The Island, also directed by Michael Bay.
Chosen answer: The battle that lead the government to hunting all transformers was in Chicago, but the incident that took Optimus out of commission was not. He'd been on the run for however long, even changing his appearance to avoid detection, when he was ambushed. Wounded, he snuck into the theater to hide before transforming one last time into vehicle form at which point he basically passed out, lost consciousness, or whatever it is robots call it when they involuntarily shut down (stasis). His aggressive reaction upon waking is simply down to his instinctive warrior reflexes immediately kicking in. All humans are a potential threat to him now, so he reacted accordingly in an instant.
Phixius ★