He caught the rumble of Orion's engine, of course, but it could've been any number of things, and so he didn't take any deeper note of it. At least not beyond a brief appreciation for the implied strength of that engine.

Well, at least until he had a finger underneath his chin, and almost automatically his stance tightened up slightly. Orion's words caused a slight twitch through his armour, and in a quick review he realised he had been (partly accidentally, partly very intentionally) laying it on a bit thick, hadn't he?

The smaller mech's tone however had his engine rumbling quietly, and Megatron didn't even nod to indicate he'd understood - not just because of the physical presence of the finger, but also the less physical implications of the very same digit. He also let his optics settle to the side and on Orion's elbow, instead of straight ahead or down on the floor, since the latter would mean he'd need to tilt his helm.

And once again, finger.

"Understood." There might have been a shadow of a smile even as he voiced his compliance, though. Orion was learning... and beyond that surprisingly quickly taking acting with what he knew and was picking up.