Animals just change emotion. They change attitudes quickly well, sometimes they just act different to their owners. It's normal.
Just give him bread, and get closer every time.
It's because he's a duck. He wants to be with his duck friends. He doesn't need you anymore since he has other ducks to communicate with.
He may still know you, but associates with them more than he does with you.
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.