Module CODE HELP: How do I run a check for when duel stops

[AzoraNova]

How do I run a check for when duel stops? I'm Working on system that needs to check status I did get some ideas looking at DuelHandler.cpp in core, so far works in logic but I can't seem to get it to detect if player fails a duel.

This is code I made up so far:

void OnDuelComplete(Player* player, Player* opponent, DuelCompleteType reason) 
{
    // Check if duel is completed
    if (reason == DUEL_WON || reason == DUEL_INTERRUPTED)
    {

        if (player->GetHealth() == 0)  // Player lost I'm also checking Health
        {
            // Player lost the duel	
        }
        else if (opponent->GetHealth() == 0)  // Opponent lost I'm also checking Health
        {
            // Opponent lost the duel
        }

    }
}

I'm guessing I'm close but missing something.. My outcome is to trigger a custom message to the loser of Duel

In top of code I have set:

#include "World.h"
#include "Player.h"
#include "WorldSession.h"
#include "Chat.h" 
#include "ObjectMgr.h"