Since the two colossal monsters or beast are fighting each other in the middle of their way, Angus's group decide to reroute their path to enter either monster or beast territory.
After thinking for a while, they decide to enter the beast's territory, hoping some high-grade beasts ignore them. Unlike the beast, if they choose monster territory, they are bound to have many fights on the way.
Monsters react aggressively towards a being that possesses mana core no matter how small it is. This is also the reason beast and monster always fight each other despite not having any major conflict.
Angus group also chose to enter the beast territory based on this knowledge. Fortunately, they didn't need to enter the territory too deep and just passed through on the outskirts of it.
Without wasting any moment, they immediately go into the beast's territory to avoid the two colossal monsters or beasts battling one with the others.