My point being, a lot of the movements that make up a chart (60-75%) are algorithms - executing trades based on chart, price and volume with buy and sell rules based on moving averages.
So knowing that, it’s quite easy to see why charts behave in certain ways sometimes… i.e. a sudden sell off below a 50 day moving average.
If I’m in that stock when that happens, that information may or may not help inform my own decision. I may say ‘It’s suddenly selling off on huge volume… might be time to trim my position back and take some profits while I have them’.