James,
The model is axiomatic. To ask questions of it demands the axioms are followed. You can't set conflicting ones. I pointed out your mixing gas with plasma for good reason. Molecular gas electrons theoretically orbit. Free electrons only exist as/in plasma. If you leave the direct path you'll find the boggy ground again. The electron may be at rest or in motion wrt the 'medium virial frame' so your scenario should have no problem.
I only referred to the 'refractive zone' as that is what the TZ 'is' (standard optics), not necessarily as what it 'does'. i.e In the first case I agreed no interaction there. But we'll return to that as we must stick to nature here not construct impossible scenario's.
You re-characterized my answer which opened room for error again; "anywhere in the medium" can include the (2 in THIS case) emitting and absorbing particles so your statement is wrong. What is correct is "C anywhere between particles" with respect to the last emitter's frame.
Lastly I also stated that in nature the distance (near field depth) cannot be 'long', and explained how it's calculated, which is a function of wavelength. This is for instance partly due to the non-linear Schrodinger equation having the 'spread function', which is poorly understood. Photons' are not some 'ballistic' entity. In quantum and laser optics Huygens Construction is ubiquitous and the only logic matching observation. This is then implicit both in findings and in the model. The emitter does not then emit a 'bullet' but a focussed fluctuation which spreads and interacts with others ('self focussed' only in Bessel beams and partly in lasers).
Now you decided to set your own axiom, suggesting; "The photon can travel a large distance without being absorbed. There is no scattering." With respect that's some other theory James, it uses old assumptions and doesn't correspond to nature. You also make other contrary assumptions, about vectors and the like. You should discuss those with someone else if you wish to insist on them as I'm here describing a different (and far more coherent!) scenario.
Now deciphering mediums 'one', 'two' and 'B', we must again identify two scenario's, one with and one without a 'dark energy' Higgs field condensate frame.
If 'With' a condensate, which is at rest in the medium one virial rest frame, then as soon as the emission (at 'c+v' in that frame) has travelled the near field depth, a fermion pair is instantaneously propagated from the excess energy (over the gamma/c optical breakdown density) in the 'medium' frame, which absorbs the photon of energy and re-emits it at c (Doppler shifted). This is what's familiarly termed 'continuous spontaneous localisation' (CSL). It has then formed a local TX of it's own. That is how they are formed (the particles mainly then instantly annihilate or 'cancel charge' over the Debye length).
If we then run it without a condensate, there are two further choices, either the pair production 'pops up' from 'nowhere' and does the same, or the emissions carry on and do relative c+v into the more dense zone until they meet a particle and are converted to the local c by it's set 'rpm' (sans Doppler shift).
In either event there is a slight rotation of the optical axis (called 'stellar aberration', 'refraction' or sometimes' curved space-time'.
In both cases any observer is simply an absorber, and will find the multi-refringence (orig. found 1921, also found as 'scintillation') caused by some axis being rotated before others in a diffuse medium (where gas is very diffuse there is still always plasma). It may be wrong, but last count there were something over 20 anomalous findings or poorly understood and non-linear effects which are predicted naturally by this model, i.e. the Kerr effects, Interstellar Faraday rotation, ecliptic plans transition, KRR, the kSZ effect etc.
P