"Akechi," Optimus repeats. "You're from the country of...Japan, I believe, then?"

Optimus had studied Earth a fair bit during his time there. If he was going to fight to protect a world for so long, he figured he should learn about it as much as he could. In any case, he moved to open the truck's hood back up again so Akechi could look at it, showing the mess Optimus had made of the engine.