I just found a skip for Osgiliath when you play as treebeard but its nearly frame perfect and hard to do. So basically I figured out that falling momentum carries thru to respawn if you die, but only for a few frames AND it takes being simultaneously bounced off of the edge barrier and pinned by a static object on respawn then a single input at the right angle launches you to the top of the skybox and you can just walk across midair once you reach max height, landing near the foot of the dam. I wasn't able to do it emptyhanded, but on carrying one of the water towers and repeating the steps it gave enough momentum to get across. I recorded myself doing it so I'll make a video and post it because noone has done this yet and I want to see it used in a run because I don't know the ins and outs, I'm just a bug hunter who stumbled across this and happened to be breaking this game today. Anyone with questions DM my discord