Is It true that Bitcoin will go down to $2221 once it has reached $4827?

According to Goldman Sachs :) Keep in mind, cryptocurrencies are super difficult to predict with their fundamental analysis. Analysis of a stocks/currencies candle-stick chart is always a 50/50 shot, even with more stable things like GM stock and the US dollar.

Bitcoins volatility puts every other asset Goldman Sachs analyses to shame. It goes through booms and busts on in a super unpredictable fashion. They would like to think they can predict BTC with fancy Fibonacci Sequences and whatnot, but I would not bet on it. I would take their analysis with a grain of salt.