How to backstab?

[Seltin]

I'm using rogue and daggers, but question, how do you perform a backstab?

I went dual wield and recently figured out that if you actually right hand and left hand attack alternating, like actual dual wielding, you do heaps more damage. But, how do I backstab assuming I am behind the opponent (my clone thing is taunting the enemy). Is it LB or LT or something else?

I think I did it once by fluke, was taunting a shield carrier guy, went behind him, pressed a button, and bam, the enemy just went down, it was awesome. Now I just want to know what I did!

[Gizmo Bizmo]

Just get straight behind them and press the normal attack button. Your positioning has to be incredibly accurate though ^^