The one that appears to be uninterested is planning his (her?) escape. I know that "Eyeing a landing spot" look.
My sister had a Korat (I don't believe it was a Russian blue, although she used the terms interchangeably.) That cat was STRONG!!! It was 100% muscle. When I would carry it from the house to the car for her, even in summer I would put on the thickest winter coat I had, and would get the cat in a tight bear hug so it couldn't move a muscle. If that cat got just the tiniest point of leverage, it would be gone in a flash, and I might not survive the encounter.
The windows were open in my office this morning, although the screens were in place, of course. Bubba was in one window, and Ella was in the other, both facing the front yard. We had another sudden thunderstorm and, at the first clap of thunder, Bubba ran so fast that he slid into the wall trying to get around the corner. He's still hiding upstairs somewhere. Ella stayed in the window. She's an old hand at thunder.
I have to be conscious of what I do in my office because Ella has come up with her own version of the cuss jar that you may have heard of. If you're not familiar with it, that would be a thing where someone had to some amount of money into a jar every time they cussed. Years ago, Ella decided that if I sang, I would have to give her a treat and, since it works to her advantage, she has kept it up. As soon as I start singing, she jumps up and goes over to the drawer where the treats are kept to wait for her treat. She has since added yawning, for some reason. If I yawn, she expects a treat. She tries adding other things, as well. I always give her a treat before I go to bed. But before I shut my computer off to go to bed, I usually play a game or two of solitaire on the computer. When the game boots up, there is a tone that sounds. Once she hears that, she takes her position by the treat drawer. As a result, if I decide to play a game of solitaire during the day, I have to remember to first turn the sound off on my computer because that sound triggers the treat response. Bubba, on the other hand, is wholly dependent upon Ella for his treats. He knows that if Ella is getting a treat, he will get a treat but he hasn't learned to make demands or to ask for himself.
Ken, I saw this today and it reminded me of Ella confiscating your chair. Three pets died, a German Shephard, a Doberman, and a Cat. In heaven they all faced God, Who wanted to know what they believed in. The German Shephard said, "I believe in discipline, bravery, and loyalty to my master." And God said, "Good, sit on my right side. Doberman, what do you believe in?" The Doberman replied, "I believe in love, care, and protection of my master" And God said, "Aha! you may sit to my left." Then God looked at the Cat and asked, "What do you believe in." The cat replied, "I believe YOU are sitting in MY seat."
When I brought a couple of my cameras in yesterday, Ella expressed a strong interest in them, so I will assume that one of the feral cats probably got pretty close to it, perhaps even claiming it as its territory, and Ella could smell the other cat. Then, Ella, who usually pays no attention to anything on television or on my computer, noticed the cats on the videos that I had taken with my camera. I had to prevent her from attacking my computer screen. She was furious, and she was angry with me. I suppose having both smelled the other cat, and seen it on my computer screen, she thought that I had somehow brought another cat into the house, and she wasn't having any of that. She still hasn't forgiven me for Bubba.
If I'm watching a video with a dog barking while Miki is in her chair beside me, she barks like she's going to tear something all to pieces. I have learned to turn the speaker off.
I imagine it's the same with dogs. Usually, when a cat meows on television, the cats pay no attention to it at all but every now and then, one will sound real to them, and they will both look around for the cat.