I don’t know if this has been posted before, and I’m sorry if it has.
When trait’ed with this on story instances, like Trouble in Fort Salma for instance, if you are downed and activate Vengeance, even if the enemy NPCs are level 80 and you manage to finish one off, you will not remove the debuff (Which will kill you in 30 seconds).
Is that intended?
I think the problem comes from the fact that most story enemies (Specially in the latest LS instances) do NOT give you any experience points, so the trait doesn’t apply.
This can get annoying, since basically your trait is worthless.