Not that he didn't have plenty of physical wounds, of course. But fighting with vocal wavelengths that affected the spark while leaving everything over it mostly intact?

After surviving fighting Megatron hand-to-hand for so long, going down to a lunatic with the Decepticon sigil for a face and overpowered vocals seemed like cheating.

"I really don't know. Other than ripping out half his throat."

Which he'd already done. Damaging the mech's vocals had been the only solution at the time, and he'd been fortunate to do it before his spark had been snuffed out.