I think the wire is a safety feature to avoid accidentally crushing people. If you try to disconnect a second wire, nothing happens, and you have to go find the

I think the wire is a safety feature to avoid accidentally crushing people. If you try to disconnect a second wire, nothing happens, and you have to go find the first disconnected wire and reconnect it. Then you will see if there is still someone in there. (When you're finished in a row, you're supposed to reconnect behind you when you leave.)