First, I would like to preface that I am level 77, clearing some NMs dungeons in the 45-50s range. I am not at the endgame yet, but I have played a decent amount. Yet, I still do not understand how bleed actually work.
First, let’s talk about Gushing Wounds. By itself, this key passive seems fine and straightforward.
The issue is that it should technically allows ALL of our bleeds to crit. Even the bleeds which already scale in proportion with our direct damage skills, like Berserk Rippling or Two Handed Sword Mastery. If taken strictly at face-value, the passive should technically allow our bleeds double-dip twice with crit damage, and do significant damage
Say we try to calculate the bleed damage dealt with Sword Mastery (20% of damage is converted to bleed). Imagine that a barbarian land a hit with a HotA that does 400k damage with vulnerable, and then you calculate the extra 500% crit damage. In theory, the mob should take 2M direct damage from the crit. Then, we should take 20% of that amount and this should be the base bleed damage dealt. With Gushing Wounds, that 400k bleed damage should be multiplied by 500%, resulting in a 2M damage bleed, in addition to the 2M damage from the crit. That should be how it should work, in theory.
In practice, the bleed is insignificant. After hitting for like 2M damage with HotA, I’m not even sure the following bleed is doing 200k damage.
I got confused, so I did some tests with some basic skills. The bleed does not make any sense. I began with a 59k crit bash on a vulnerable target, and that did 10 ticks of 263 bleed damage. So a total of 2.6k bleed. Waaay less than the expected 12k bleed damage. Then, i followed with a 2200 damage bash, that did 10 ticks of 850 damage, for a total of 8500 bleed. I then did a 8500 crit, that did 843 bleed ticks, for a total of 8430 bleed damage.
What I concluded for sure is that the bleed from Sword Mastery has a base damage that is independent from the damage dealt by the skill itself, and it does not crit at the same rate. Both seem to have an independant crit chance. The bleed portion of the damage also does not seem to gain benefits from vulnerable.
I also did a some tests with rend, and the crit rate from the bleed seems to be much lower than the direct damage from rend. My hypothesis is that the bleed probably uses the base crit rate, and is not modified by talents or glyphs, but it is a wild guess that could be totally wrong.
Has anyone done significant testing with bleeds? I would be curious to see how they actually work, and what I might be mistaken about.