A volcano eruption has a process; it initially emits faint smoke, which then shoots towards the sky. Large quantities of volcanic ash mixed with lava spurt out, but at the very beginning, it is just some volcanic ash. The full-scale eruption of lava requires a certain amount of time. Thus, for the moment, the volcanic eruption did not possess enough threat to everyone's lives.
But, Mount Almans was not an ordinary volcano; it was a habitat for a massive number of magical beasts. The volcano eruption equally posed a notorious threat to these creatures. They must run to survive, escaping from the range of the volcano's eruption. This act of fleeing was not exclusive to the sixth-grade magic beast, Thorny Wood Boar, but also the seventh, eighth, and even ninth-grade magic beasts. In the face of the overwhelming forces of nature, only a very few exceptionally powerful beasts remained unafraid.