Eon's trip through the marshy environment was nothing spectacular. His near-death state made it so he had to rest often. Resting also meant disabling his protective separate space.
Whenever this happened he would be attacked by all sorts of magical beasts. Some were common and others were entirely new to him. The maw of the magical lizard that seemed capable of stretching far beyond what the hinges of most would allow was such a bizarre creature.
Not to mention how this was coupled with its amazing grip strength and tough scales. Chances were that if you were caught, the only release you'd be getting was death.
So even as he coughed up blood and slit it in half from the neck down he was left mesmerized by its uniqueness. That being said, it wasn't all that unique. He had found some common points it had with creatures in its own environment, which was expected, or those from other dungeons.