Originally Posted by
Lhun
Everyone is missing this here. With vengeance up, you counterattack EVERY...HIT...YOU...TAKE...FROM WHAT YOU ARE TANKING. Including abilities! You also get health from your regular auto attacks, your ability combos, and everything else you happen to be doing at the time. Combine that with unchained as well, and the potential self healing during the duration of bloodbath is much higher.
Even though you're not getting the attack animation for Veng, it goes off every single time you are attacked by an enemy in any way, which in turn with bloodbath, heals you.