"HMMMM?" Grimlock grunts, tiny little optics coming to focus on the human hovering in front of him. "Human? Fly...?" Humans aren't supposed to fly, except... he remembers some of his programming from TRIDENT, protocol for dealing with super humans, which he had been assured that he would inevitably come across and that they would very likely try to kill him.

Remembering that, his uneven optics go wide, and he snorts a puff of air in Rex's direction. "Hmm! Flying human bad! Me Grimlock DESTROY!!!"

And then he proceeds to take a snap at him.