This practice can be used at moments of anxiety, fear, worry, or whatever is keeping our mind and emotions from being at peace. The main idea behind this practice is to return to the present, to self at times when we have an extremely emotional or mental experience. The purpose of this practice is to awaken from the experience that we are having, just like we wake up from a bad dream.
sometimes when we feel heavy emotions, it seems like they pin us down, corners us, the heaviness is inescapable. However, if you think about emotions in general including the heavy emotions. Emotion is not a being of its own, it doesn't have a mind of its own, it doesn't have a purpose of its own, it doesn't have a will.