"It wasn't as if I wanted to!" he bursts out, growing increasingly frantic. "The Decepticons, they... they are my charges as much as his, and Megatron was not doing right by them. I was desperate, I needed to do something! As a fellow leader, surely you of all people can understand that." He tucks his head down, keeping his stance low and non-threatening, and peers up at Optimus with wide optics. "Besides, in a way you really have me to thank for the successful return of the Matrix to its rightful bearer, so alls well that ends well, right?"