Guild Wars 2

[Engineer]
It seems to me that it’s a bug, since it impairs a skill’s feature.
Ok, knockback is a disable. But at the same time, it makes no sense to interrupt self-knockback, because when I use it, I am doing it on purpose – and then it’s mostly an escape tool rather than disable.
Also since the trait has a delay (it usually triggers when you’re launched almost full distance), neither does it prevent you from being launched nor from wasting a stun break.
Such behaviour renders it completely useless when using rifle, which is the only weapon that makes use of the fury it provides – not counting Scrapper here.
Also 40s cooldown is way too high if it is to work like that.

Thesis: It should only affect CC originating from enemies.

Ps: If you get pulled to res it should prevent it as well, because it’s the same kind of disable, isn`t it?

Head Butt activates Last Stand on Warrior.

Like you said, a disable is a disable: The passives don’t care if it is self inflicted.