new _maxPlayers;

public plugin_init()
{
   _maxPlayers = get_maxplayers();

public fw_TakeDamage(victim, inflictor, attacker, Float:damage)
{
   if (attacker == 0 || attacker > _maxPlayers)
      return HAM_IGNORED;

   // Check that damage was done with egon
   if (inflictor == attacker)
   {
      if (get_user_weapon(attacker) != HLW_EGON) return HAM_IGNORED;
   }
   else
   {
      if (inflictor < _maxPlayers) return HAM_IGNORED;
      new classname[64];
      pev(inflictor, pev_classname, classname, charsmax(classname));
      if (!equal(classname, "weapon_egon")) return HAM_IGNORED;
   }