When there’s blood on the streets, it’s time to buy. So said Warren Buffett, and if a 75% drop from peak to trough isn’t bloody enough for you, then I don’t know what is. That’s the drop that the Invesco Golden Dragon China ETF (NASDAQ: PGJ) experienced in the past twelve months, and you can almost hear its investors cry for mercy. Q4 2021 hedge fund letters, conferences and more It started with increased scrutiny from the Chinese authorities into antitrust practices by some of the biggest stocks, then record breaking fines started to add up. This was followed by fresh headwinds in the form of…