"Lifting Thrust" is just not happening I get about 3-4 different ones. Was the Lifting Thrust removed with the patch?
From the kill camera page - http://elderscrolls.wikia.com/wiki/Kill_Camera
Lifting thrust - The Dragonborn thrusts the blade into the mid-section of the target, lifting them off the ground.
My Two handed perk tree looks like this:
http://skyrimcalculator.com/60046