The next scenario is a free balloon, moving with the wind (this is a popular "special" jump at boogies, etc.). The balloon has non-zero groundspeed. Yet when we look at the smoke trails we see that the smoke has blown along with the balloon, and the second jumper exits into the smoke trail of the first jumper. In other words - the jumpers are in the same column of air. Note also that the light trails show distinct and separate paths as viewed from the ground.