You didn't leave after the threat of Megatron had been eliminated. ( A statement, not a question. Shockwave hums, and the motions of his hands falter slightly. ) I thought the decision was illogical ( He frowns, as if the word itself left a bad taste in his mouth. He doesn't deal with the memories. Or at least he doesn't try to - knowing that the echoing refrain of 'what have I done' will ring in his audials forever without thinking on his past actions for the last four million years. ) when I heard of it. The war was over - why would you stay on a planet that didn't want you?

( Declining to remark upon the wisdom of any of Optimus's choices, he continues. )

I failed to take into account that you would not simply stand by and watch others suffer because of you.