Wow, you have just described the fight between my mother’s 7 pound cat and the Doberman who tried to get her. Cat jumped on the head, gouged out the eyes with hind feet while ripping the jugular with her teeth.
As I said, it’s the classic cat attack strategy for existential threats.
Cats have four different combat styles; hunting, exterminating vermin that are not food, sparring with other cats, and go-for-broke-no-holds-barred kill or be killed. The last looks nothing like the other three we are more familiar with; that’s what’s you saw then and what you see in the video on this thread. This is a cat that has classed that dog (correctly) as an existential threat to someone she cares about and she’s going to do something about it.
The funny thing here is that by definition, cats *have* to be smart enough to process the environment and determine which response is appropriate for the scenario the cat finds themselves in.