The miasmic beasts gathered at the edge of the meadow around the huge lake were full of confusion.
Something in their mind told them to go around hunting for beings that weren't choked full of miasma, but another voice in their mind also told them to stay put and let nothing go past them and reach the lake. Their natural instinct was to roam around and hunt, and yet they couldn't move away past a certain point.
Some tried to challenge this restriction and stepped over the forbidden line. But the moment they were about to do it, the voice grew stronger and yanked them back to the boring formation, or some 'guards' tackled and dragged them there.
The beasts, freshly out of dungeons and yet to adapt to being submitted to a higher order, were frustrated and restless. Perhaps because of this, their senses became a bit dull.
When a giant shredding machine in the shape of a Serpent crashed against them, they couldn't even react.