i was surprised to see the market today, everything fell in a short time, bitcoin fell around $1000 very fast and looking at coinmarketcap, all coins are red. a few days ago bitcoin rose slowly, but today was very surprising. What happen today?

Dont be surprise in the coming days as we are closer to halving , there are more activities like this or much worst because we knew that Bull will come after the bear ends ,
with at least year before the bitcoin halving happens then expect more of this so don't be surprised .
BEAR market still not over yet and recently there so many bad news hanging around, especially the problem between the biggest exchange in the world which is binance got sues from SEC and already under investigation.
seems bearish just gets prolonged, we could even hardly consider the previous rally of some altcoins to be bullish because only very few chosen alts are rising the other are just still having some stagnation.
right now the condition become even worse, as the lawsuit unfolds, surely there will be waves of correction in which many investment will not get spared at all.
the market keeps holding 25k but no sign of dropping bellow as this was happened recently
https://coinmarketcap.com/currencies/bitcoin/markets/Hope that in the coming days we will be stable again.