@EventHandler
    public void onEntityDamage(EntityDamageEvent event)
    {
        if (event.getEntity() instanceof Player)
        {
            Player player = (Player)event.getEntity();
            if (plugin.blueg.contains(player) || plugin.redg.contains(player))
            {
                if (player.getLastDamageCause() instanceof Player)
                {
                    Player d = (Player)player.getLastDamageCause().getEntity();
                    if (d != player)
                    {
                        if (plugin.redg.contains(player) && plugin.redg.contains(d))
                        {
                            event.setCancelled(true);
                        }
                        if (plugin.blueg.contains(player) && plugin.blueg.contains(d))
                        {
                            event.setCancelled(true);
                        }
                    }
                }
            }
        }
    }