Megatron is contractually obligated not to destroy trespassers into his biome, but he very much has the desire to do so. Life is hard when you can't easily rid yourself of nosy organic creatures.

He finishes the cube of energon, emptying the transparent container of fuel. For a few seconds, he doesn't seem to acknowledge Rico's existence, allowing him closer observation of the half-easy chair, half-Sentinel Prime eternally wrapped around a piece of furniture as decoration.

That is, until he releases the empty cube over the side of the arm, letting it crash perilously close to his new guest.

"Nothing bests a physical reminder for proper motivation."