Making a Missile Hit the Ground

[Dunkelheit II 0]

Hi. Suppose we have a ground vehicle and an AT missile flying to it. The IncomingMissile eventhandler identifies it. The question is: how to make the missile hit the ground 15 m before it using the setpos, setdir or setVectorDirAndUp commands and taking into account that the missile can also fly to it from above? Using camCreate or createVehicle to replace it is not an option. Thanks.