Are you sure? That wouldnt make any sense… Against those opponents who have lots of hp it would do nothing while it would shred through normal and magic enemies that die quickly anyways.
Some math: My bow has 2.6 attacks per second with 4 multishot. With 60% crushing blow that would equal 2.6×4×0.6=624% against one target
That would mean i can proc crushing blow against a normal target 6.2 times per second
Magic target 3.7 times per second
Rare target 2.2 times per second
Epic target only 1.3 times.
Keep in mind that this is only if that is the only target you are attacking! Shoukd the question below have “yes” as an answer that would increase the amount of times you can proc crushing blow (unless it does nothing) as arrows can pierce the same target multiple times.
On a sidenote: Can DoTs cause crushing blow? Can arrows that pierced a target cause DoTs on the 2nd and 3rd etc. target hit? What about mirror images? Can they proc crushing? (You should really add a training dummy in a future patch so I can answer such questions myself >.<
Also, concerning pierce: If it goes through an opponent and hits another one, does it have a chance to apply onhit?