How do they not notice a rocket being set-up at point blank rocket range?

The homemade rocket is not accurate and appears to hit a garbage bin prior to making contact with the building. A sniper inside the building would be suffering, if not dead from the concussive blast and overpressure.

 

The rocket fired in video does not appear to be the regional classic, homemade 107mm Vulkan rocket like here:

https://pbs.twimg.com/media/CYiLkPXWwAEIFkZ.jpg:large

https://pbs.twimg.com/media/CYiLjYNWYAA7Bzb.jpg:large

https://www.youtube.com/watch?v=VbXLXJHycTg

 

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