"Infinite Swords Storm"
Ainsley wanted to use these infected victims as a meat shield. Wait. No. It's a meat wall to defend from Michael's ultimate attack.
It was a meat wall instead of just a shield because there would be a sheer number of infected people used as shields.
On the other hand, the big bosses all wanted to use their ultimate attack, and whether the domain could withstand the impact or not made Raguel break into a cold sweat.
The Armageddon Domain must be the one that would receive the biggest impact from the collision of so many ultimate attacks, but even so, the Hellbreak Domain might get some impact.
Raguel and Queen Rachel's were to kill Lucifer and Atherton in this chaos, thus reversing the situation with their victory.
Raguel was sure that Michael would die anyway, and once Satan crushed the domain core that Ainsley had handed over, the Armageddon Domain would collapse.