I hope I didn't just forget the Centaur was poisoned/ignited or something, BUT given some other things I've seen my suspicions are aroused
It seems like Emit Sparks is triggering Pariah even when it misses.
Also Emit sparks wakes up every sleeping demon at once- whether it hits them or not! Seeing as how you can Ember Burst sleeping demons with impunity, I don't know if Emit Sparks is supposed to wake them up just for threatening them.
As an aside, though it's unreliable, Bolt Chain can make for an impressive number of Pariah triggers.