The Undead Tribe on the city walls were actually well prepared. The Fire Mages were positioned in spots that were easier to move from... after all, no one knew which direction the Air God Creatures would choose to climb up from.
At most, they needed to run a bit faster... anyway, the Undead Tribe wouldn't feel fatigued, and their stamina wouldn't be easily depleted by these small matters.
To some extent, Hill could understand the mindset of those who preferred to give up the thrill of a few battles to stick with a Fire Element Profession.
Some people will always hold true to their faith... Fireball Technique is the eternal god.
The speed of the Undead Tribe was indeed quite fast. Just as the Divine Beasts used their giant fists to smash the stone Great Wall, they were met with a frontal assault: Blizzard on one side, Meteor Fire Rain on the other.
