@SubscribeEvent
public void onOverlayRendered(RenderGameOverlayEvent.Pre event)
{
    if (event.type != RenderGameOverlayEvent.ElementType.PORTAL)
        return;
    EntityClientPlayerMP player = Minecraft.getMinecraft().thePlayer;
    if (isMyPotionActive)
    {
        if ((Boolean) ReflectionHelper.getPrivateValue(Entity.class, player, "field_71087_bX", "inPortal") == false)
        {
            player.timeInPortal = 0.3F;
            player.prevTimeInPortal = 0.25F;
            event.setCanceled(true);
        }
    } else
    {
        if (!player.isPotionActive(Potion.confusion) && (Boolean) ReflectionHelper.getPrivateValue(Entity.class, player, "field_71087_bX", "inPortal") == false)
        {
            player.timeInPortal = 0;
        }
    }
}