The tandem may be set up so that the 2nd person is facing the rear but the rear cyclist pedals forwards as usual. The chain from the rear BB to the cassette crosses over in a figure 8 pattern.
I didn’t get to try it but my son did.
There was one ride on a quiet back road when Jim & Maria were riding the tandem and had pulled up in front of my kids as they were pedaling along side-by-side. It was really cool because she could talk and chat with them behind her, facing them, as they pedaled. A tandem such as this one would be great for teaching a riding class or doing rear-facing camera work.
There was enough isolation and flat straightaways on this road, my kids could have been tutored in the art of drafting, though at a slower learning speed.
This might even be a good thing to have in some rehabilitation programs. It would be much easier to hear each other, two people cycling along this way. For example, a cyclist on the back seat who can do sign language, communicating with a deaf cyclist riding solo behind them.
My kids are getting really good at riding their Cruzbikes without using their hands. I wonder if there has been any interest in Cruzbikes yet, among the deaf.