At first it appears that the cat was enjoying the light bouncing. When the child bounced harder the cat got increasingly distressed and near the end had its ears laid back. A cat's intestinal system isn't the same as a five year old child's to take all of that jostling. And you try to stand on your feet and get off a moving trampoline. I wonder if the mother would have kept saying "jump harder" if the girl's baby brother or sister were on that trampoline.