What is the luminous thing in Louis Haunted House 3?

Usually, in general, press the f key. Ghost cats will run away when they appear. You can see the footprints of ghost cats by dim light. After catching up, you can use a flash to illuminate and let the ghost cat show its true colors. At first, it will appear on the floor of the studio. After sucking off a tail, it will come to the courtyard floor on the seventh floor.