Those are infact bail slings from climbers who realized they were off route. The "real" third pitch of OS begins about 20' left of the crackline you climbed.
What you did is apparently harder, or at least much pumpier.
Like I said, I've never climbed it before and we only had Kramer with us. I climbed to the rap slings, so it couldn't be that hard (protected well), and I got past it by A0ing it up to the alcove. The crack 20 ft to the left was wet. The friction in between looked pretty slim for protection.