The price of Ethereum follows the price of Bitcoin due to the fact that this is the first and largest crypto currency that affects all prices in this market. No one can tell the exact reasons for the fall of Ethereum and it does not matter, the main thing is to look at the current news that are able to send the price of ETH to the moon.
Yes thats true, no one can tell what happen to the ethereum price. As the ETH price followed the trend of bitcoin price then as bitcoin price go up then ETH will also follow.