I'm not sure if this has been discovered by others, but I found this yesterday and decided to upload it. If you try to roll on the ledge or use the normal get-up animation while Randall is beneath you, you will start on the ledge and travel with Randall while the animation continues. I assume Fox maintains invincibility and the ledge is treated like normal for a roll (other people can't grab it in the animation), but I didn't have anyone else to test it out with.
EDIT: By the way, sorry for the poor video quality. My capture card is acting up a bit.
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