Yes May Altcoins drop more bceause of Bitcoin continues to rise through Fork, And People are expecting free Bitcoin Gold On 25th October if they will hold their Bitcoin in Bittrex and some other Exchanges. Its happening same like Bitcoin Cash. It may be the reason people are buying more Bitcoin to get Free Bitcoin Gold Equally.
So this coming october 25 there is a bitcoin fork again and they will give another free coin like bitcoin cash? Hmmmp thats quite a lot of money for a millionaire holder in bitcoin