Pretty sure the explosions and sounds are both fake, the goal is to weaken the "pull it" narrative because only one video of many has these flashes and these bangs. I've seen other demolitions, they don't have flashes because the explosives arent meant to be fire works. Most explosives barely create a flash of light let alone consistently long enough flashes that an old digital camera would catch multiple flashes with such similar consistency. The way it fell is more than enough evidence of intentional demolition the question is whether Larry silverstein was lying when he said the fire department/chief asked him if they should pull it. There is a distinct possibility every american metropolis is pre-wired for demolition in the event of catastrophic damage and of course that would be a guarded secret, and if that secret is known to intel agencies of course they could more easily justify such a false flag attack.