If I understand you right, what you are missing is the timer id and then clearing it before you start a new transition.
I managed to fix it by mixing a bit of my code with yours, I understood I needed a timer...
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.