[grotesqueness]

It is not black hole lah. 
Wind in sure has wind out.

it is easy to demonstrate if you dare to try it

you get a double decker bus speed pass you 1 meter away from the bus sides at 100km/h
the wind turbulent will blow you away on it sides and as the bus pass you from it back
the bus end as it speed away will suck you  back in at  it rear end


you can try 

the push and pull effect  of  big truck air turbulent