AOE? Really? I thought the skill was single-target. Hmm, I'll have to take a second look...

What I do know, is that you achieve the combo by using a skill with knockdown (Neutron Stomp, Singularity) and then adding back-breaker to it when theyre on the ground, making a combo that's called back-breaker. Good damage I guess, but it doesn't seem AOE to me, and for enemies who can't be knocked down (hovering droids and non-mini bosses) it doesn't combo.