The light is created every 2 Ticks when the player was hit (I "trace" every 2 Ticks).

The light is created on the TARGET vector which is set by my "trace" function.

As you noticed, it is -not- right where your crosshiar is, but where the -hit bone- is, directed towards the shot origin.

However, you still have to crosscheck if there was a wall between the model and the shot origin.
But as this may differ quite strong from game to game I left it out.

Maybe Trace towards the shot direction with only scanning level geometry, store the result (distance) and then check if it is smaller than vec_dist(shot_origin, TARGET.X);

I could make the return value of the funtion as the distance from the shot origin to the hit position and still NULL when nothing was hit if it helps?