Turns out Rex's reflexes aren't exactly faster than a rampaging t-rex, just barely managing to throw up his arms in defense before Grimlock hits him like a train. His metal gauntlets take most of the impact, the metal groaning and some of the more fragile pieces breaking off.

A little dazed from the force of the hit, Rex scrambles to keep a hold on Grimlock's forehead before he slid into his mouth or something equally dumb. He recalls the nanites from the jetpack build before that gets snapped off and to shed the extra weight. Not exactly how he had planned on this fight starting out.