The market seems to be bleeding now, Bitcoin is only down by 8% at the moment but major altcoins are down double digit.
https://coinmarketcap.com/

Will this be the start of the bear season?

We haven't witnessed a long and major dump this year yet, so seeing this might cause some panic especially on the altcoins holders as they are the ones who will significantly be affected since we know what would happen to altcoins if bitcoin struggles.

As per Binance exchange, the 24 hours low of bitcoin is $42500, so what's next?
https://www.binance.com/en/trade/BTC_USDT