Cats can be very protective. Sometimes they misunderstand the situation and rush to help the owner when there is actually no necessity in it like in this case. When kitty hears that something threatens the baby it immediately intervenes. It seems to the cat that the baby is in danger. In reality, the toddler knocks the glass to the floor by chance and begins crying. Crying became a warning signal for the cat. It runs downstairs to see what is happening. At this time the babysitter pushes the baby away as she does not want him to be injured by stepping on broken glass. But kitty thinks that baby is abused and attacks to protect its human! The cat is very persistent and want to protect the boy by all means possible! So cute!