You need to explain this better, as I can't make sense of it, sorry. What are A and B to start. Do you want A to go on if B goes off?
Sounds like a relay. Edit: re additional details. Wire B can power a relay, and the NC (normally closed) contact of the relay.
Power from the source goes through the NC contacts to the bell. The relay normally has power, which interrupts the power to the bell. Cut wire B, the relay opens up, the NC contacts close, providing power to the bell.
I cant really gove you an answer,but what I can give you is a way to a solution, that is you have to find the anglde that you relate to or peaks your interest. A good paper is one that people get drawn into because it reaches them ln some way.As for me WW11 to me, I think of the holocaust and the effect it had on the survivors, their families and those who stood by and did nothing until it was too late.