Bloodthirst discussion plz
I don’t believe Well of Blood can trigger Vampiric or Vampiric Precision as it does not normally affect enemies.
Siphons don’t crit.
WoB will siphon when traited with Vampiric Rituals according to the wiki if the enemy stands in it; been so long since I used those traits my memory is fuzzy though.
Vampiric should trigger with Vampiric Rituals, because you are hitting a target (if there is one.)
And also, if you spec at least 15 into blood for whatever build you’re using, does it display the life siphon health and damage on your attacks in game? Maybe it’s just not all the gw2 build generators are fully updated, though they do have all the new skills/runes/sigils and trait changes there…
All wells will siphon with Vampiric and Vampiric Rituals no matter what, so long as there is something to siphon from. However, a well has to deal direct damage, and that damage needs to crit, to proc Vampiric Precision.
Well of Blood deals no direct damage though, so it can’t crit. You can also notice this because dropping well of blood on a golem in heart of the mists won’t drop you into combat, despite dealing damage to the golem via siphoning.