1>
downdistance = c_trace(my.x,vector(my.x,my.y,my.z-5000),IGNORE_ME | IGNORE_PASSABLE | USE_BOX);
my.z -= downdistance;

2> "hit" is only valid in lite-c, and from version A7.08 onwards.

"There is no fate but what WE make." - CEO Cyberdyne Systems Corp.
A8.30.5 Commercial