That sure is a wry almost-smile Optimus gives Mikaela. He's well aware of the difficulties presented. "So long as you are willing to try, I will appreciate your help. Until I can once again meet up with Ratchet and those Autobots still on Earth, I do not think there are many better options available."

So he's resigning himself - or trying to - staying here as long as she'll let him. Well, as long as he can, as well.

"And so long as you are aware that there is a danger," he adds, growing a bit serious. He wants - needs her to understand this.