Even at night, the angels were working non-stop. Leon had already thought that before, but they looked more like zombies or machines when they were working or fighting. They didn't consider things like a numerical disadvantage, and in most cases, the only option they could see was to fight.
Regardless, the magic circle had already been created. The angels engraved the circle on the earth and added some sort of paint that wouldn't let the land absorb the monsters' blood. At the moment, they were just adding blood to that paint on the ground.
"So, that is how they are preventing the blood from being absorbed..."
Leon and the harvesters were flying high on the sky because they were planning to attack the points where the angels were still working. If they wanted to succeed, they had to kill as many angels as they could before their boss shows up. The best way to do that would be to attack the places the angels were in and move on using Leon's Transfer.
"Let's go," Jorhorn said.