В гайде для фури-воина, времен WotLK на сайте elitistjerks.com, считают, что после:
Impale makes your special (yellow) critical strikes hit harder. It increases the bonus damage by 20% in the form 100%+20%. This means that these critical strikes will do 100%+100%+20%=220% damage instead of 200% damage normally. We will speak of crit bonus damage a few more times, so it is important to understand how to apply crit bonus damage. Normal damage is always static and bonus damage goes up or down based on how talents or other things affect it. Here's a picture.
TotalCritDamage = NormalDamage + BonusDamage
Impale also has repercussions on the effect of a [Relentless Earthsiege Diamond] or [Chaotic Skyflare Diamond]. When a special (yellow) critical strike occurs, the 3% bonus of the meta gem is applied first, taking into account the 200% critical strike damage. This results in the strike causing 206% damage. The damage of a non-critical strike is then subtracted from this in order to determine the crit bonus damage portion of the strike which is 106%. This portion of the damage is then multiplied by the 20% bonus from Impale, resulting in 127.2% crit bonus damage, summing to 227.2% normal damage on the impaled special critical strike.
