A Shadow Cat casting Hypnosis on the party.
Hypnosis (催眠 , Saimin?) is a Black Enemy Tech used by Shadow Cats in Chrono Cross. This tech allows its user to cast a hypnotic wave on its foes to temporarily seal their ability to cast black elements. The Shadow Cat will only cast this element when the field color is entirely black.
The Shadow Cat in question will first arch its back, whereupon the camera will shift its focus onto the foes. Skeletal spirits are observed to swirl around all foes for a short while before fading away.