Still work in progress. I haven't clearly set out that Bit and Bob have to be separate entities though associated so they are separable.
Likening the picture to 'bouncing oil droplets; The bit 'bubble is like the droplet. The bob wave, inherited sympathetic frequency, like the external disturbance associated with the droplet, but not it.
I think getting the probabilities of passing. There is the forwards travel direction and also orientation of magnetic and electric fields, which will affect interaction with the chemical structure of the polarizer. I'm still unclear about the role of each. Thinking about a theoretical landscape of probabilities varying over 360 degrees for each direction. If that is helpful I'm not sure.