You'd be hard-pressed to find a worse insult than Starscream saying he might've done the same in your shoes, and the comment makes Rodimus' spark burn. The energon charge in Rodimus' blaster is hot, and he can feel it sizzling against his internal circuitry, but he ignores it.

"I'm not interested in what you'd've done in my shoes, you slag-licking scum," he snarls, stepping closer to Starscream, right up in his hypothetical grille [except not, because he's a jet HOHO], blaster still raised and ready. "The Decepticons were JUST as useless in Nyon as you are now."

He pauses, glancing past Starscream; he can't see any sign of the Alternian anymore, and that fact only makes him more angry. He grits his teeth and looks back up at Starscream. "So how about you get out of my way before I have to blast a hole through you."