only 1 empty seat

So, I’m sitting on the train, with my headphones on, minding my business, and at the next stop this man is with his wife ( the seat next me is the only empty seat on the train) enters the train, looks at the empty seat and at me, and he says, “my wife and I would like to sit together.” And I said, “then you’ll need to find 2 empty seats.” He and his wife stood there and looked at me for about 10 seconds and I sat there staring back as the man breathed heavily and they both walked away. I don’t know what they were expecting. Actually I do-they wanted me to get up, but it wasn’t gonna happen. Not today. Not ever.