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This MAY be a slightly different video of the shooting with more detail:

That looks different from the video I saw, but it doesn't change my view of what happened: The guy in the yellow hat seemed to be moving to assist someone else who was being attacked. He was intercepted, and was himself attacked. He tried to move away to the right, but the crowd was too thick, so he turned around and tried to find another way out. He was then surrounded and attacked again, pulled out his gun, and fired.

I think this video provides a little better self-defense argument than the video I first saw. You see the crowd closing in on him, and he could justifiably have feared for his safety and even his life.