How do you know it was karate or which kind?
@shortstories The spinning hook kick narrows it down to 4 arts, all of which are at least somewhat related: kickboxing, savate, karate, taekwondo.
What narrows it down to karate is the punching. Kickboxing and savate use boxing-style punching, so they're out. That's the karate straight punch, usually done to the body, but here he's doing it to the head.
He tends to square up and get in close, which is a very kyokushin habit, where they like to absorb body shots to toughen up.
@shortstories Thank you, those options account for 0.5% of cases where someone fights like this. Let's just say you won this internet argument because I don't have time to play "but maybe aliens taught him".