int headShotCount[127]; //bad, but whatever
extern cPlayer *(*FindPlayer)(int);


//player join
headshotCount[playerId] = 0;

//when player is damaged:
void my_script::Damaged(GameObject *o, GameObject *Attacker, float damage)
{
   int playerId = Get_Player_Id(o);
   cPlayer *p = FindPlayer(playerId);
   if(!p) return;

   headShotCount[playerId] = p->HeadShots;
}

//when player is killed
void my_script::Killed(GameObject *o, GameObject *Attacker)
{
   int killerId = Get_Player_Id(Attacker);
   cPlayer *killer = FindPlayer(killerId);
   if(!killer) return;
   if(killer->HeadShots > headShotCount[killerId])
   {
      headShotCount[killerId] = killer->HeadShots;
      Console_Input("msg headshot");
   }
}