What did I miss here? I just jumped off that thing yesterday and after talking to the guy (or listening to him) got an extra level in speechcraft but didn't notice any random quest. I could have missed it because of the Foresworn fighting me though.
I wouldn't call it an easter egg (unless I misunderstand the term) because it wasn't like a random find. The thing was called Bard's Leap and went into a pool of water. It was pretty obvious that we are meant to jump from there.