Oh dang! thank you so much for letting me know - there are so many combos now its hard for me to test them all. so sorry you got stuck - yea i think maybe it should just proc once? I'll try and get a fix up for this sometime this weekend
i think it also goes for the distillation with "before attacking" from the Hero slayer and the "on attack" from the Prophet's guardian, but i'm not entirely sure since i haven't tried those out.