[SPOILER] Stuck on Cistern stage; valves won't budge

[gregarious24]

I can only assume you're referring to the rocks around the bridge. I actually noticed those right away, but I have a very difficult time throwing anything accurately, so I didn't think that would be the method to cut the chain. Plus, as I said earlier, whoever made that walkthrough video seemingly never needed to cross the bridge, so I'd really put it in the back of my mind.

But if you all agree that, in order to get the sewer drained, I've gotta keep hurling rocks at that chain, hoping to eventually connect so I can get to that third valve on the other side, then that's what I'll do.