Interestingly, here's some pictures I found of a black hole with similar blue trail:


The smoke puffs in the middle possibly but not the outer spiral. One theory suggests that the outer spiral was the fuel being sprayed out as the rocket spun and then the light refracted off of it. This is BS if you ask me. Firstly for the reasons cited above, plus, and here is the kicker, It happened at night. There is no light to refract. 

Oh well, I admit I never really was that interested in weapons testing or such but I do have an opinion or few about weapons. Anyway this is not the topic to discuss it, so I'll leave it at that..
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