It was blood!
The blood of the person just now!
Underneath the blood splatter, Sui Yi's Magnetic Sensation probed into the water. The flowing water greatly consumed the Magnetic Sensation, making it even more difficult than looking at a wall. Perhaps it was related to the movement, making the Magnetic Sensation unstable, which was why she hadn't used Magnetic Sensation to probe the water earlier...
Now the murky, turbulent water was consuming even more of the Magnetic Sensation, but she still saw the mangled corpse being churned and bitten under the blood splatter, vaguely hundreds of creatures, each about the length of a middle finger, thin-bodied, black in color. The rest was too blurred to make out, seeming mostly like a mass of sharp sawteeth, viciously biting a person into a mess of wounds.
