one of the guys I work with at my other job hit the sprinkler system with the fork lift. They banned him from the fork lift, and we all joke about how he "struck oil".
I think it was a controlled demolition because look how the shelves crimped in the center then fell neatly into it's own footprint at nearly freefall speed. You can see dust from the squibs and if there were sound I'm sure that you could hear the store manager saying over the loudspeaker, "Pull aisle seven."
Don't be fooled, that was all junk they couldn't sell. It was all bagged up for the trash already.
It's all just part of the deception.
Can you imagine how in the few frames where the guy fell as he was trying to bolt away it must have felt like trying to run in a nightmare?
He really got the hell out of there like any good worker, not just far enough away to get clear of the avalanche, but far enough away to deny involvement.
"Uh no...I really didn't see anything. It was break time and I was out here and uh... the shelf just went."