Being Launched- Stun breakers fail.
Vibor Bauman- Level 80 Engineer- Gandara
Stun-breaker skills seem to interact oddly with knockdown/knockback skills as well (they only work once your character has stopped moving and has begun the ‘getting up’ animation, and cancels that animation), which leads me to believe that it may not be intended for stun-breakers to be used to get out of knocks early. It just seems kind of weird and almost glitchy, like that animation-canceling glitch with the Mesmer greatsword (not sure if they fixed that).
Just a feeling I have.