[He could lie to her. He could say something profound or try and make a big, supportive speech. But he's not good at that. So he opts for honesty. The words might be harsh, but... he does his best to keep his tone even.]

Nothing is going to change that.

No leaking, or shouting... no matter how many times you fight back. Always going to come out tired. Run down. Battle... is exhausting. Anyone who says different is a liar or a fool.

[He pauses, there, to gather his thoughts. He doesn't usually monologue like this. That's... That was always Optimus' job.]

We either give in to the weariness, let it overcome us, and shut down. Or... we stand, we gather our forces, our allies, and fight. Long as we have to -- to survive.

[He uses that word on purpose -- he'd called her a survivor before. No harm in trying to emphasize it.]