"..sounds a bit too far.." - Oh, that's no good. ;( , coming from someonw who can hike for miles with a watermelon in the top of their pack with no complaining.
I re-checked, and, yes, there have been three deaths on Swan's Song that I know of, one where a guy placed a piton behind a loose block that crushed his leg and a team who fell when their piton anchor pulled out. It is the most deadly route on Cannon. I always think of Nazgul flying around when I think of that route.