Well, if I may play Devil's Advocate here, look at it this way.
Undertaker is a 300+ pound man with supernatural strength and abilities. Now he's got you gripped in an arm wringer and while gripped tight, he ascends the ropes adding pressure to the hold via the angle and height. Now if you push him out of the ring, he will take your arm with him and you're looking at a tear. And to pull him from the top rope you'd have to overpower him and only Batista in his prime was THAT strong.
It's not perfect, it takes a little time and suspension but it CAN work.