From MC's perspective:
They didn't look at the 2 trapped humanoid monsters in the field. Rather the humanoid monster's eyes flickered with a greedy glint.
The monsters are greedy for their life. The emotion shown is different from other wild monsters in the Trial.
Meanwhile,
I have managed to stabilize the field. The dark power was not enough to break the field. Fortunately, there are only 2 monsters trapped under the field.
If there is one more, then it would be impossible to control the field.
At the same time, I felt something strange. Like someone is watching from the dark. As this feeling rose, I felt a strong chill in my back.
It's not a coincidence. I think the other monsters have appeared. But they're hiding in the dark. Thanks to the experience of the previous floors.
I know the monsters love to hide in the dark and watch their prey struggle. This almost gives me creepy vibes.