The Slump Lizards seemed unable to control their hunger, devouring the Shell Moss to their limit. And once they did so, they were at the beck and call of the Carcass Snail, hence charging across the surface.
An Empyrean Zinger Scout kept watch over the river, observing everything in detail. It didn't have night vision and hence couldn't see things clearly. But it could still rely upon other senses to get a feel for things happening at the moment.
The Empyrean Zinger Scout within the dome approached the Carcass Snail's shell and determined a spot undetectable to the people, watching from there.
The moment the Carcass Snail unleashed the streams of Shell Moss and instigated the Slump Lizards, the people within the dome grunted as their bodies began to change.