Analysis here
http://www.funker530.com/hamas-caught-editing-footage-of-israeli-airstrike-that-collapsed-building/
OK, 20 minutes snipped. I didn’t notice that shadow in the lower left when I watched it.
It's most telling to watch the smoke from the "roof tap" clean itself up suddenly to make way for the main shot, which neatly drops the apartment building on top of the target.