I had an interesting dream last night. I wanted to win a foot race against a beam of light. So i conducted all kinds of experiments. (in my dream) When i woke up, I did a few searches on google and came across this - New Kind of Light Created in Physics Breakthrough
Bottom line is that "Bose–Einstein condensate is propagation of light through a "medium". Many mediums including water "appear" to slow light down. When light is absorbed in a medium, it takes time to re-emit. Bose–Einstein medium is unique for a few reasons. Best explained in a couple very short videos here:
If you can run faster than 38mph/ 17 meters per second, you could win the race with light in a Bose-Einstein condensate. Keep in mind it is the stopping then re-starting that is "slowing" the light down.
