All rods in his body got removed between the beach and the first obstacle he destroys while on land iirc, but he continues to walk for a while before he stops as there are fixed spots he will power down on. He will never reach the encampment, but will stop outside infront of the ballistas aiming towards the mountain pass.

As a side note.

On my second playthrough the rod which got immortal in his left knee became unbugged far later when a cutscene played, but certainly this is way beyond the time you get the achievement.