I played a Castle DLC game yesterday afternoon, rushed to support a team mate against an enemy. Saw that the enemy had a hardlight shield up so that my team mate couldn't kill him.
I easily managed to run up behind him but when I went for the assassination, I got a beat down instead and was pretty disappointed knowing that unless I boosted (which I only do for dead games or impossible MP achievements), I'd never have the chance to get that series of events happening again.
"If you don't like something, don't watch it again. Why whinge about it on a forum to a load of divs? Don't worry about it." - Karl Pilkington