MANY have sat and watched while we continually go up. They were caught unaware.
We had our decisive tests of remaining supply. Now, “smart money” operators have decided it's to be marked up. The previous drives down has establish a "mental" thought of a continued repetition of the same move. In reality, this marks the beginning of a new uptrend, trapping the late sellers, or bears. In Wyckoff's method, a successful test of supply represented by a spring (or a shakeout) provides a high-probability trading opportunity. A low-volume spring (or a low-volume test of a shakeout) indicates we are likely ready to move up, so this is a good time to initiate at least a partial long position.
The appearance of an SOS shortly after a spring or shakeout validates this analysis quite easily. However, in Accumulation Schematic #2, the testing of supply can occur higher up in the TR WITHOUT a spring or shakeout; when this occurs, the identification of a change in trend can be hard to identify without also using proper indicators.