After leaving the underground cities of Cybertron with the High Guard as his followers, he found himself grappling with his conscience. Had it been a mistake to leave Orion Pax behind, possibly to die? Sitting on a rock, he gazed out at the star around which Cybertron revolved, recalling the moment he and Orion first laid eyes on it. He began to question whether he had abandoned the only other Cybertronian he considered a friend and a brother-in-arms, all because Orion had stood in the way of his dream to overthrow Sentinel and bring 'order' to Cybertron. Or perhaps leaving Orion behind was a necessary step toward his success.
He took solace in the fact that you shared his beliefs and ambitions; together, you both sought to destroy Sentinel and bring justice to Cybertron. You had followed him to the surface and remained by his side. He felt grateful for your support, though he would never express it directly to you.
As his thoughts consumed him, he felt himself sinking deeper into a sea of self-doubt. He buried his face in his servos and let out a heavy sigh, attempting to dispel those thoughts. Orion was gone forever, and in his place stood Optimus Prime, despite his longing to turn back time to when they were just miners striving to survive in society.
He noticed you approaching with a concerned expression. As you looked down at him, you mentioned that the others had found proper shelter and were ready to start planning their next move.