Stop comparing two completely different things. Yeah, I know that Bitcoin and alts are somewhat called the same - cryptocurrencies, but the cost needed to pay to buy each of them is different based on many factors. I don't believe alts are following the movement of Bitcoins, but yes, Bitcoin had a freefall due to investors taking out their money from such ICOs which failed to fulfill their promises they were launched for, and trust me, the number is really big. That's one of the major reasons why we saw a big drop in the total crypto market cap. Bitcoin is here (at its current price) due to many reasons, but it's good that it's not so volatile these days and following a stable trend except those tricky pumps happening to sweep innocent people's money and put it in the hands of exchanges itself.
in this case whether the altcoin will follow the movement of Bitcoin or even bitcoin will lose,
people will still choose Bitcoin as a coin investment or choose altcoin as a short-term investment ..
we see next year ..

As said, alts are losing significantly because the use case has never been met and due to the fear that crypto might go dead any time (government interference, money being swiped off, etc.), people (under the FUD influence) are selling their coins dirt cheap - the same scene as banks that if all of their customers suddenly stand up and ask for their money's withdrawal, even banks will pull their hands off and go bankrupt - a case of lower demand where speculation ends up harshly due to public interest diminishing. No doubt that if alts are here to stay and go bullish, Bitcoin needs to stand and remain bullish as well but to what I've observed, alts don't follow the exact same BTC pattern and either side needs to wait till one holds dominance.