Cat gets startled by something unseen?? Read Description!

Our kitten his name is Boo walks out of the room to the left, then walks down the hallway. He stops and turns around randomly looking down the hallway. He stands there for a few seconds then he starts to run away scared. You can tell by the way he is low to the floor and not knowing where to run until he comes into the bedroom. Once in the bedroom he hides and once I’m able to get him out he basically clings to me and is shaking. No idea what scared him so bad when I looked nothing was there, n when I watched the cameras again nothing I can see. It’s very strange he’s never acted like that nor do the other animals.