He sensed some kind of unusual "presence" in the room. Cats and also dogs have that ability.

They have very poor vision (like 20/200 for ppl) and so they can see things as blurry moving things.

Insects, bits of fluff or dust, cobwebs moving in an airflow can ALL trigger this.

Have you seen the "cat freaks out at cucumber" clips? Welcome to having a cat.

Mine does it whenever Amazon crosses into town. About 5 mins after he does the same you mentioned, they show up.

I wish I could say I was kidding.

Sorry, I was just passing through 👻

Sorry to ask, but where are you from? Don't have to be details. What state or country?

Ghosts

It could be that he is HEARING something that is upsetting to him, in the higher registers beyond human hearing. It could be that he is looking around trying to FIND the source of the sound that only he can hear.

call upon Jesus

There was definitely something there. They see in a wider light spectrum, so we can't always see what they see.

Just to say cats can sense spirits - but do not be afraid.

Ghost?

Ghosts !

They see spirits

Something spooked him.

I have a cat that goes psychotic occasionally. Frigging whack jobs, cats are.

Yo that's scary af

Your houses is haunted.

Spooks!

Yeah, nope we'd be moving out straight after that

Probably bored and seeking some excitement. Cats are like that,,,,

Is the poltergeist back?