int nUser=GetUserDefinedEventNumber();

void main()
{
switch (nUser)
{

case 1006: //on damaged

int nowHP=GetCurrentHitPoints(OBJECT_SELF);

int fullHP=GetMaxHitPoints(OBJECT_SELF);

if ((nowHP * 3) <= fullHP) //less than 1/3 HP

{

//surrender
SurrenderToEnemies();

object oPC=GetLastDamager();
ClearAllActions();
AssignCommand(oPC, ClearAllActions());
ActionStartConversation(oPC, "conv_orcyield");
}

break;
}
}