secondly, it was very well expected to see a huge panic-y breakout like this when the price started reversing. in fact people were expecting this the day price fell below $10k that we are going to see a FOMO buy. the money is the same money that went out when price fell, it was "waiting" to enter as soon as reversal occurred.
altcoins have never followed bitcoin, their value against bitcoin is actually declining. the reason why you see a rise is because sites like CMC are reporting the price in USD instead of BTC. all they had to do was not fall that much against BTC to show a rise in their USD value!!!