Haha yes to cut it down involved some serious plot streamlining and a little sleight of hand.

SPOILERS
That was a big pill to swallow for me as well until I thought about it some more. Why did Ben not kill Vader!!?? The reason in Ben’s Jedi mind is from guilt and to show mercy. To make this a little easier to take I did two things. First I added in a flashback to him and Anakin training right before Ben escapes being buried under rocks. So we see Anakin again. Second after Vader is beaten and wheezing, I removed his line about destroying Ben. This makes him seem even weaker and maybe having second thoughts. A slightly easier (but not easy) pill to swallow now when Ben shows mercy.