Although the roars of the Abyssal Dragon were not harming anyone as they had no malicious intent, they were extremely scary. Even more terrifying were those who fought against it not long ago, died, and were revived soon after.
Although pain in this world is limited to barely 5% of the real world, the pain that many soldiers must have felt when they were crushed to death was surely not especially pleasant to remember even if it was only as minimal as possible.