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This might help. Try to visualize things from the air perspective. It is standing still, a mostly stationary air mass. The vehicle moves into the space and creates a high pressure moving the air out of the way (no compression sub-sonic). Behind the vehicle is a low pressure zone (air already moved out of the way). This high pressure air wants to move into the low the most efficient way it can. The air hugs the vehicle every chance it gets unless a shape forces it further away. As the vehicle passes the stationary point you have visualized, the air collapses back into the low pressure wake. How rapidly, depends on the relative pressures which is related to the speed of the vehicle.
Hope this helps. Critique and correction of my depiction is welcome.
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