I'm pretty sure I saw at least one limb ripped off as they were piling on top of Shockwave, which is why I assumed he was completely dismembered... but when he showed up later, all that was missing was one of this tank-tread bits on his back, and a crack on his eye.
Maybe the animator for that scene got a bit too carried away, based on the script, but didn't know or realise that the character was supposed to come out virtually unscarred.

I'm trying to remember (without going back to rewatch it)... I don't think his re-appearance added to the plot in any way, so maybe it would have been a more fitting loose end to tie up if he had been killed in that scene, and any lines he said later were said by someone else or just not included.