In the moment the Ratman escaped using strange witchcraft, Ybur was furious.
"You've been running away all this time, and you can still run?!"
"Fine, run if you must, but at least leave that bone staff in your hands behind!"
Initially, Ybur could only seethe with impotent rage, but it suddenly noticed that after the Ratman left, the fluctuations in space hadn't fully dissipated, like ripples in the water after a stone is thrown in—different from Spell, witchcraft's power wasn't so "precisely controllable." After the guy used witchcraft to complete the spatial transfer, he left behind very apparent traces.
Although it wouldn't take long for these spatial disturbances to vanish but...
Ybur elongated its own body into a plane, sensing the spatial fluctuations pass through its body. A dimensional rift slowly opened on its body's surface, undulating gently with the spatial waves.