"...No, they are not my allies," Optimus replies, sounding a bit exasperated at the very notion. "They're regular vehicles. I'm simply trying to repair them for any humans or other appropriate sized lifeforms that might need them."

He stood up, before shifting into the form of a semi truck cab before Sephiroth's eyes. His voice then emanated from the cab, his words signified by his headlights flashing. "My kind take the form of such vehicles for the sake of disguise, so that we may hide among your people, should the need arise."