! Maybe that two hands represent Santana who was defeated by Joseph and left behind by Cars before that.
! That's the most obvious explanation, but it seems rather unnecessarily. I mean, all of the pillarmen are defeated eventually (though Cars lives) so shouldn't all of the hands, or all but one pair crumble? Furthermore, AC/DC only has a slightly larger role than Santana. The fact that it's eight hands reaching for the Red Stone means it's probably the Pillarmen, but I don't see the point in having Santana crumble just because he's not part of the main group. Still, I can't think of any other meaning to it.