[Snake]

It was changed before that skills which ignore Evasion will also ignore Cobra Stance's Snake Dancer. It seems like Falcon Strike is not really doing that unless you do something really mysterious, which is dashing on the tile behind the Demon Hunter's back. That probably means the skill works right, but the small interaction of resonating feathers, the animation and Danger Sense makes that point moot or glitchy.

For instance, another skill that ignores evasion, Lance de Lion, properly ignores Snake Dancer's proc, so it's safe to say this is not intended.