The Dink Network

I have an object which spawns the following script when touched:

void main( void )
{
freeze(1);
fade_down();
say_stop("&vision", 1);
&vision += 1;
say_stop("&vision", 1);
sp_x(1, 520);
sp_y(1, 200);
sp_dir(1, 4);
//load_screen();
draw_screen();
say_stop("&vision", 1);
draw_status();
freeze(1);
fade_up();
unfreeze(1);
kill_this_task();
}

&vision changes from 0 to 1, but draw_screen seems to change it back. I could probably use force_vision or something, but I was wondering if this "bug" (hardly a bug) was well known.

I think the vision-changing-with-fadedown effect was done a lot in SoP, seemingly to redraw hardness...