It didn't take the five Tier I Tainted fighters long to arrive. Judging by how near the battlefield they were, Reign could infer that they had been there for a while, seemingly waiting for the best time to appear and fight.
Five Tier I combatants were enough to completely turn the battlefield over as they could deal with most of the monsters present by themselves. It seems that the five had already had suspicions of the horde of monsters being drawn over to them and waited in order to see who was doing it.
Beast's arrow was the one thing they needed in order to confirm their suspicion. A Tier I attack that killed one of their brethren made it clear that there was someone pulling strings from the shadows. The Five quickly went out of the array and immediately started a slaughter as they made their way toward Reign and the others.
