He doesn't stop her. Both because he doesn't want to struggle about anything with anyone at the moment, and because, well, he doesn't really want to die. After everything he's read, he can't say he isn't afraid that they'd decide to leave him if it was clear he wouldn't be of use.

Even if that image of the Autobots doesn't seem to be lining up at all. Not with this one, and not really with the others. They hadn't responded to him with fear or trepidation, just...concern for someone they cared about.

Maybe Optimus Prime was more charismatic than he has been imagining. He doesn't really know. The point is, she isn't listening to him, and he really doesn't want to have to explain.

"I am speaking the truth," he says slowly. "I am not Optimus Prime, and...I have no recollection of ever being him."