As a divinatory line, nine at the third place of Breakthrough reads within the hexagram's overall concern with the culprit's guilt exhibited at the royal court, with sincere and earnest appeal, and a consciousness of the peril in cutting the criminal off. The line occupies a place proper to its own nature in the classical doctrine that odd places favour a firm, yang line and even places favour a yielding, yin line. Its own text, that strong and determined looks that invite evil, yet the superior man, resolute, walks alone and gets clear in the end, is the particular fortune assigned to this one stage of the situation, not to the hexagram as a whole.
The third line corresponds by classical convention with the sixth line, and the two correspond here, since one line is yin and the other yang. Read together with the trigram it belongs to, Qian in the lower position of the figure, the line marks the hinge between the two trigrams, the last word the lower trigram gets before the upper trigram takes over, one stage in the six stage movement the hexagram traces from its first line to its last.
A change at this line, from yang to its opposite, is the mechanism the tradition uses to move from one hexagram to another. Flipping the third line of Breakthrough turns Qian into Dui while the other trigram, Dui, stays as it is, which yields Breakthrough's changing partner, The Joyous (King Wen 58), the hexagram this line is recorded as transforming into.