A smart trader would rarely try and catch a shitcoin on the way down.  That's suicidal.

But when the fundamentals are strong in a coin, you have a top tier dev, news sources are starting to report on your coin, and you see a low volume retracement with a high volume blowoff low, you're not catching a falling knife.  You're catching a baby falling out of a 3rd story window that you now get to watch grow into a toddler, then a teenager, then an adult.