From: Trevor Hancher <drone@io.org>

If anyone is interested , here's an addition I've made to GAME.CON . It 
causes the player to leave a blood trail and slowly lose health once his 
health drops below 20 (or whatever you want). It adds a bit of a 
challenge to solo play, and allows you to track down wounded in 
DukeMatch.
 
 Anyways, it goes in around line 1000 between the two lines I have 
marked :

    ifaction 0 action PSTAND // enter code below this line
    
    ifrnd 1 ifphealthl 20 
    {
        spawn BLOODPOOL
        addphealth -1 // you lose this amount of health when you bleed
        soundonce DUKE_LONGTERM_PAIN
    }
    
    ifdead // enter code above this line

 Of note, the ifrnd 1 controls the frequency of bleeding (increase 1 to 
bleed faster) and the 20 controls the health below which you will bleed.

Hope you enjoy this :)
 
 Trev
 drone@io.org