No need to migrate, just perform the c_trace after the c_move HITS the target.
Code:
...
you=NULL;
dist = c_move(me, reldist, NULL, IGNORE_ME|IGNORE_PASSABLE|IGNORE_SPRITES);
if(you!=NULL)   
{  //hit some entity
   c_trace(me.x, you.x, IGNORE_ME|IGNORE_PASSABLE|IGNORE_SPRITES|SCAN_TEXTURE);
   //do something with the texture tex_name
}
...


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