So I read in some old threads that RY and Hasch's halos to Yhwach disable the moment they die in battle
I assume that it applies to all other partner to partner halos like Stern-Muken and HVI-Kokuto,but does it apply to whole team halos like Ginjo's and Hasch's 50% def to the whole team?
It doesn't matter if the halo increase a specific character's parameter, or the whole team, or decrease the opponent's team.... The halo and its effects are gone once the caster is dead, it doesn't stay forever.