Not sure if this is exclusive to the new Atrium stage but I've noticed it every time I play there.
If the chair is placed somewhere and you walk across it while holding onto an opponent in grab made, it will cause the chair to flicker as long as the opponent's body is moving across it.
If the chair is placed somewhere and you walk across it while holding onto an opponent in grab made, it will cause the chair to flicker as long as the opponent's body is moving across it.