There are no invincibility frames on any class until they revive. that's it, people just don't get it. You can snipe someone mid blink, mid shade step, etc.

also when u activate ur super, nightstalker does not get an increase in armor to the point where they can survive 2 rockets to the face. literally I just did it a bit ago where i activated my super right when this guy was in mid swipe with his bladedancer and i took no damage at all. its not lag, every super has had an invisibility frame when activating their super since yr 1. nightstalkers is just a bit more annoying cause they can activate that shit 3 times using quiver.

Bladedancer has hit detection issues, along with shoulder charge. More likely than anything that's what it was. From someone who has been sniped mid shadestep and during blink, there are no god like frames. In the video of OP his rocket missed and hit the wall behind the Hunter and he was far enough away with a bit more armor to take minimal damage.