Originally posted by Lord Lucien
It's hard to discern your point...
My point is, Luke did make it clear later on, with Gethzarion, and at Leia's dumb courtship with Han, that Vader had held back on him.
Vader had made it emotionally clear, both at the end of ESB, and during RotJ that he didn't want Luke to get hurt or die - and this came out bit by bit.