A Bash that cannot be evaded... Greater Bash

You read it right. There's absolutely no way to stop Spiritbreaker's Greater Bash because it can neither be evaded nor be missed. Let us take an insight to this skill:

[Greater Bash]
Gives a 17% chance to bash enemies across the ground, doing more initial damage and damage as they skid.
Level 1 - 25 bonus damage, 140 knockback distance.
Level 2 - 50 bonus damage, 180 knockback distance.
Level 3 - 75 bonus damage. 220 knockback distance.
Level 4 - 100 bonus damage. 260 knockback distance.
Mana Cost: N/A
Cooldown: N/A
Insight:
Greater Bash is triggered to work at the beginning of your attack, this means before you actually deal the damage. Seeing as it is not actually part of your attack and triggers before you actually hit the target, it has a 17% chance to trigger even if you miss your regular attack.
Greater Bash completely ignores if Spirit Breaker actually hits the target. All that is important is that Spirit Breaker starts an attack against the target. And thats why it can't be evaded or missed by any means.
Total of 0.95/1.15/1.35/1.55 seconds of slide time for level 1/2/3/4 respectively. This can also be viewed in terms of Stun seconds.
Greater Bash triggers at most once every 1.5 seconds.
Target will destroy trees in its slide path. If his path is blocked by a cliff/ledge, he will start making jerking movements.
The bonus damage (25/50/75/100) is dealt all at once at the start of the Greater Bash.
The damage is blocked by spell immunity but the target still gets knocked back.
Deals magical damage.