Imagine you buy an egg for 1,016,314,041,716 each.
Will you continue to buy more?
This is what is happening now.
The whales pushed the market higher, and along the way you, I and others bought. Then they will start selling some of their bags and will sell just enough coins to make it look like a big drop is happening.
This will strike fear into the hearts of retail traders (you), forcing them to cut their profits or even sell at a loss.
This will also cause the price to drop even further, so now the egg is not 10$ , it is 6 or 7$
This way they will buy, repeat the process and make more money.
I am sure that no whale will want to sell their holdings before the halving.