Here is a more visual representation of my previous statement. The trajectory due to wind deflection is grossly exaggerated to illustrate the point.
A bullet will move increasingly far offline [laterally] under the influence of a side wind (
left panel, blue line). The lateral displacement is a curve, and this is why wind deflection at increasing distance is not simply additive (i.e. a straight line off to one side).
If the effect of wind stops at some point along the trajectory as shown in the
right panel, let's say because there's a wall, or thick line of trees, the bullet will continue offline along the tangent line to the curve it had been traveling under the influence of the wind (
red line). It will not return to some perfectly straight trajectory perfectly perpendicular to the target as it would have if there was no wind at all to begin with. It won't. It will continue to move further offline at an angle to the [straight] line of sight unless acted upon by some additional lateral force. It will not be displaced as far offline as it would if the wind continued for its full flight, but it won't go back to the original [straight] trajectory (perpendicular to the target face), either.
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