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.

https://youtu.be/bFEFYidH044

 

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