Zero line hasn't broken yet, so what you're referring as 2-4 Trendline could be 3.2-3.4 trendline also. Even more bullish scenario would be that the top was an irregular and we're still in W3.4. This irregular B/X scenario will be negated if Monday NIFTY goes lower than Friday, because zsro line will be finally broken then, confirming W3 was done at top and W4 is now running.