If I had to short in an alternative method that is not harmonic trading, my stop loss would be similar but at 1.28215. At the moment the trend seems likely to continue south. This is an expectation - not a prediction.
(Disclaimer: This is NOT to suggest that Alexander's stop loss is wrong. It is correct based on his own methods/trading plan. Traders should trade their own plans and make their own risk assessments based on what they see.)