Before a dancer leaps into the air he goes into a crouch to set himself for the spring. I found it was the same with stocks. They usually did not suddenly shoot up from 50 to 70. In other words, I considered that a stock in upward trend that reacted to 45 after reaching 50 was like a dancer crouching, ready for the spring-up. Later when I had more experience I also learned that this 45 position in a stock after a 50 high point has another important benefit. It shakes out the weak and frightened stockholders who mistake this reaction for a drop, and enables the stock to advance more rapidly.
