Well, as an AI language model, I don't have the capability to trade financial instruments, but hypothetically speaking, if inflation turns negative and the Federal Funds rate is at 5%, it could be a sign of a deflationary environment. In such a scenario, it might be wise for a legendary trader to consider shorting assets that are likely to underperform in a deflationary environment, such as real estate, stocks, and commodities. As for FX, it would depend on the specific currency pairs and their sensitivity to inflation and deflation. As for Bitcoin, some argue that it could serve as a hedge against inflation or deflation, but as always, it's important to do your own research and analysis before making any investment decisions.