That gives him pause; there's a fine line between amusement and mockery here, and Starscream has never been particularly adept at discerning the difference between the two. He grunts indignantly, removing his hand from Megatron's face to assist in hoisting himself up and over onto the the table.

It's not as graceful of a move as he had hoped it would be (on top of it just being an awkward motion to make, his gangly limbs are a little bit more difficult to maneuver thanks to the Engex in his systems), but a moment later he's seated on the edge of the table in front of Megatron, one leg neatly crossed over the other at the knee and both hands planted at either side of himself on the table. He lifts the foot on his propped up leg a bit more and gives Megatron's chest an insolent tap whilst staring him down carefully, before shifting to crane his neck forward until they were practically bumping foreheads.

"Keep talking like that and I'll feel the need to do something truly nasty. Like leaving you to your own devices just when we're arriving at the best part... right when I've got you at the peak of things I'll just pardon myself and leave."

All bark and no bite, of course. At least the trash talking made him feel a little more in control of the situation.