I think the strategy is a more down-balanced situation analysis. If you fall a lot, you can sell it at the opportunity to buy, but some coins fall very fast, you may only have to wait for it to rise again. This is the risk of investment.
Yes you are right with that. That's why is a must just to left some BTC in your portfolio atleast 20% - 30% so when the market goes down you can buy the dip of the altcoins you think it will go back strongly in short time. Goodluck everyone.