Impulse and correction,
We have a perfect example down here. In this trade setup price was forming impulse and then correction in the form of Flag and keep falling price repeat this pattern very often.
In the following chart, Price formed Impulse and the possibilities of flag formation were very high.
In the following chart we can see price started to form the flag and were completing that trade setup which were being expected before its formation,
In the following chart, We can see that price repeated that same behaviour and formed that trend continuation pattern which we call flag and started to fall and completed the wave which we were anticipating before its formation.