Thinking of this, Jerry's eyes became brighter. Everything that was happening was visible to his eyes. His entire field of vision was filled with countless strange fishes.
This was originally an abnormal thing. With this number of strange fishes following them at the bottom of the swamp, he started to noticed it.
After the strange fishes died, there was no flesh or blood.
To be precise, the strange fishes that attacked them were formed from the mud in the swamp.
This could explain why the carcass of these strange fishes corroded their divine barrier after they died. Besides, when they fell to the ground, they would form a new small swamp.
After Apollo's reminder, Jerry was more certain that all of these attacks were coming from one single creature hiding in the swamp.
It was likely that it was a creature that had mastered some sort of domain. This domain was just like Harris's swamp domain back then.