Blood Bond trait - inconsistent behavior
You’re right, it does require facing your opponent like the original Vamp Signet skill.
Whether or not the real Vamp Signet shoul require facing your target is debatable, but in case of the lesser version it should absolutely not because you rarely every get to control when and on which target it triggers.
You don’t see the icd of the trait (maybe there should be an icon when it’s ready, same for plague sending etc), and when the trait is off cd you have a lot of random aoe bleeds flying around that are rather likely to hit targets that are standing behind you, like from Epidemic, Barbed Precision, corrupting vigor, Weakening Shroud…
So yeah, this should definitely be changed to not require facing.