I ' ve been told by people from there that it ' s largely because the UK often treats NI like a bastard child . Policies , etc , that work for other parts of the UK often don ' t for NI . I don ' t know how true this is though . I hear similar about Scotland . <| sep |> Check mages and healerspreists in towns , they ' ll typically be able to teach you . for a price naturally . <| sep |> This is interesting to think about for a bit . You are correct , the pulse of light would be moving backwards from the particle ' s point of view . But this is different from light moving away from you in most contexts because here the Poynting vector and the group velocity are now in opposite directions . I ' m not really sure what all the consequences of that would be , to be honest . You get a similar situation without the Doppler shift when light enters a material with a negative refractive index , which you can achieve with some metamaterials . This radiation doesn ' t really look like anything from the particle ' s point of view because the particle never catches its own shock wave . But as soon as the particle pops out of the dielectric material the Cherenkov radiation would catch up with it , only now as normal photons . You might also need a mirror or lens to direct the radiation at the particle , since Cherenkov radiation propagates at a fixed angle . The light will also reach the particle in the reverse order it was created , so the particle would see a time reversed view of the process . I did find a paper that works this problem out for protons and neutrons , but I can only access the abstract . As a side point , it is better to interpret the photons in a dielectric material as quasiparticles that have a finite rest mass and propagate at a speed less than c rather than real photons moving at c and bouncing off of atoms . The interaction of the electric field with the dipoles of the atomsmolecules in a dielectric isn ' t analogous to absorption and emission of real photons by atoms .