Okay so he definitely was not expecting that. Goddamn trolls are always full of unpleasant surprises though, and reflecting on this later he will probably curse himself for not seeing this coming.

"Insolent--" Starscream shrieks and thrashes, spinning in circles while trying to reach his back, but his arms aren't exactly meant to bend that way so it's a futile effort. He gives his wings a good shake up and down a few times too, just for good measure.