Why is this Indian Hedge fund going short on Amazon?

In Mid-June 2016, we called out our position on Amazon. We did short the shares of Amazon based on the signals generated by our Algorithms. Lets understand a few basics of Amazon stock on the bourses. At a price of $844 per share and above, Amazon's market capitalisation is over US $ 400 billion. Compared to Walmart its peer in brick and mortar, its revenues are one-fourth of Walmart (Amazon's revenues also includes the revenues from cloud and other tech infrastructure services apart from ecommerce). While the metrics for valuation of an ecommerce is vaguely different from its peers in