"He is still so angry," Optimus says, his voice still low and somber, "over events that no one has control over any longer. I had expected better of him, in my absence. I had expected that he would not make further trouble when things were already so dire. He was quick to show great remorse, but equally quick to turn on me when I did not consider that to be enough."

He vents, slowly.

"He was used to threaten me. Megatron threatened to tear him apart in front of me, when I had...no capability to withstand such threats."