Man Gong is saying the true Zen Master both attains and falls down. And in that attainment of falling down, there is no attainment. And there is no mistake. It is only when we are worried about our particular life that a mistake is possible. When we live our big life we make only big mistakes which are only for all beings.
Form is form, emptiness is emptiness.
If the fist is so, the open palm is not. One time on Vulture Peak, the Buddha held up a flower. Only Mahakashyapa smiled. If you hear both sounds you are already in hell. When your conscious- ness is discriminating this from that, comparing, how could you possibly know God.