Users here are always very supportive

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To streetshooter, maybe next time I can take a shot of them lit up and see if they will look less so : )
Genster and Tim, great to "see" you here and thanks! Tim, yes their presence gave a sense of some foothold to hold on to against the "something" looming over from the background.
Steve and MarcusEyre1, it was really a reflection of the mindset of the shooter. I am pretty sure that the next time I go past the scene and take a shot, the mood will be different from this one.
AlbertTRAL, thank you too. It was the contrast that first drew my attention. Usually when I shoot the sky, there would be a passer-by or two looking up towards the same direction and made a facial expression that "The silly man is shooting some silly pictures." The same happened in this case. Probably this is a photographer's eye that makes us stand out. Right? Keep up all of your good work in pursuing photography!