First, the proc chance seems a lot lower than indicated. It says “up to 50% chance on lucky hit”, but I only say 5-10 procs after casting lunging strike or flay ~150 times. I also got only like 1 proc after whirlwinding (with bleed) for like 5 minutes. It’s completely unclear what the actual proc rate is but it’s too low to be useful.
EDIT: maybe I was unlucky or didn’t see the procs. I went back and tried again and saw a higher proc rate with lunging strike. I also tried out HOTA and found about 1 proc per cast when hitting a group of enemies. Points below still stand.
Second, since thorns can’t lucky hit, thorns bleed can’t trigger it. OK boohoo, thorns doesn’t have synergy with lucky hit. But it’s sad.
Thirdly and most crushingly: Rupture’s AOE apparently has 0% chance to trigger this. Why? That spell is probably the best and most flavorful way to apply bleeds that barb has. And it doesn’t trigger the effect of the best bleed ring in the game? Apparently this is because the AOE is not direct damage and so can’t lucky hit…