Good work by the cat!
Actually, this is a case of edited video.
The whole video shows the cat to be the A$$hat. Kid was on the bed minding his own biz when the cat tried to chew his feet off.
What you see here is Johnny boy defending his feet from being chewed off.
Cat did in fact need smacked.
LOL, but I blame the mom behind the camera for letting it go on too long.
Kid WILL grow up, cat WILL lose all future encounters.