Ace realized his weakness and the limitation of his power. It's good for fighting another superhuman, but not monsters. Mark brought him into that dungeon to break his overconfidence and teach him how to fight with limited options on a battlefield filled with monsters.
"Exactly, that's why you need to make a plan after observing them. Why do you think that information notification keeps popping up? Think before you act... Anyway, focus on killing for now," said Mark while continuing to burn as many side dishes as he could before the arrival of the main course.
"But why the heck are they not attacking?" Ace asked in confusion after sensing no hostility from those flying monsters, "Why the heck are we attacking?" He looked toward Mark.
"Well, because... They don't have time for us. They are running away from that thing," Mark replied, pointing at the north.