I have a suggestion that would have solved the whole problem as it stood to begin with. Simply have the relic removed from the carrier's hand and put back in the center of the arena if the carrier tries to jump onto one of those platforms. This way teams can still have snipers to take out enemies/Templar when needed, but other groups would absolutely have to kill oracles as the relic carrier would not be able to simply cleanse everyone in a timely manner. The said snipers would have to jump back to the arena before the ritual and would have to survive the enemies on the ground as well before getting cleansed. This seems like the easiest way that anyone could make it, and would keep the best parts of both worlds for the raid, you can use strategy and planning and yet still have the absolute chaos of the battlefield on the ground.