A Crushing Blow is an attack made only by NPCs that does 150% of normal attack damage.
Level 70 tank vs. level 73 raid boss, the formula would be 2% * 15 - 15%. Or 30% - 15%, for a 15% final chance. That means 15% of the time, an attack by the Mob will be a Crushing Blow.
Here is the table (NPC Vs Player):
Miss (Base 5%)
Dodge
Parry
Block
Critical
Crushing Blow
Ordinary Hit
With a base 5% chance to be Missed, if you had a 95% chance to Dodge attacks, then anything below Dodge on that Table gets "pushed off". It can't be one of the potential results of the attack.
That's all "Pushing it off the Table" means.
So a 95% Dodge would mean that for that attack, it could not result in a Parry, Block, Critical Strike, Crushing Blow or Ordinary Hit.
Feral don't wear a shield, so can not block, instead they bear-face tank with extremely high dodge/hp/armor.