I'm surprised that rock didn' crunch your whole fender. The picture looks like that rock alone is keeping your rear axle from flexing & allowing your LF to drop a little more.. doesn't look like any articulation at all.
Or is that just a leaf spring thing?
82 fj40, 99 uzj100, 06 gx470
97 DR650, 05 525EXC, 01 XT225, 09 TTR125, 07 TTR90, 07 CRF50