The undead army's steps have never slowed. After losing their lives, they no longer feel fatigue. At the same time, the pain of unrest and jealousy and hatred toward all remaining vibrant lives will accompany them forever.
As for the Elf Clan warriors who have already become corpses, the undead will absolutely pay no extra attention. Whether it's Vampires or Ghosts, they silently drift past those battle lines, continuing in the direction of the Erutalon River. Although heading straight for Heather Holy Mountain would save more distance, the undead seemingly don't care about wasting that bit of time. To them, time is as insignificant as pity and conscience.
However, Lynch believed that to avoid the layers of obstruction from the Elf archers in the forest, flying over the Erutalon River would be a good choice. It offered enough cover and wouldn't lead them into ambushes due to blocked vision in the woods.