The sky trail has nothing to do with the flash! This looks like a fuelling facility and there is a ship tied up to the facility. The lights that are shown are not all on only the few to the right and left of the photo. The small lights are those probably on the ship and this facility has pipelines on the shore very close. This could be a flash burn from one of the valves and what you took is the end of the flash. Sort of a safety burn if pressure is building. The trail in the sky does not end at the light at all if you zoom in you can see the angle is wrong.
I donèt know if someone else suggested this however I did not have time to read 33 pages, sorry! But the flame and smoke suggest a burst which would burn outwards and end quickly.