It hits with a no doubt satisfying clonk and Sentinel makes an - also, undoubtedly satisfying - pain noise and stumbles. Just a dang ol' nondescript noise.

He takes that as his cue to grab some debris off the ground and fling it at Megatron's head while closing the distance between them to try and deliver an UPPERCUT. Motherfucker he will noogie Megatron only instead of playful brotherly love he'll be trying to cave his head in!!