I spoke to one of the rangers on Sat afternoon. The accident was on Yum Yum Yab Yum. The second, who outweighed the belayer by around 100 lbs, sustained some cuts and bruises and may have broken a few ribs. He also had a nasty cut on his head, probably from his helmet. Nothing life threatening. Apparently a piece popped when he fell which didn't help the situation. The belayer sustained what was described as "third degree burns" on both hands. The ranger described it as "horrible". One theory as to the cause is that the belayer had her device rigged to the anchor instead of redirecting through the anchor and belaying off her harness. Since both hands were burned it seems likely that she screwed up to some degree.