Eren watched for over two hours, maybe even more as he didn't have a clock in this forest.
The battle shifted constantly as new creatures showed up and others retreated or died. At one point he tried counting and got to at least thirty-five different species in the clearing, fighting or eating or just wandering through and taking a bite out of whatever was closest.
He started noticing patterns the longer he watched. The physical fighters always went after isolated targets. The magical ones attacked from range in groups. The scavengers sat at the edges and only moved when something fresh died. The ambush types like the spiders and the two-headed serpent picked off anything that strayed too far from the main fight.
This is an ecosystem. The battle IS the ecosystem. Every creature here knows what it's supposed to do and does the same thing every time.
