Ok listen i'll just say it i don't think it's a big deal.
My black arrow it's a poison, it super kills after a cycle.
So there was no reason for blue's passive to be activated on that shoot not until next cycle.
I'm saying it bc i have a passive that says " as undead i'm immune to poisons " and i think that passive is common to all undead ( which is the reason the write up redirect from scourge failed on me )