The sixth and topmost line ends the hexagram with conflict rather than harmony. Legge's translation gives dragons fighting in the wild, their blood purple and yellow. The image is startling within a hexagram otherwise built entirely from yielding, modest, and restrained imagery: frost, a tied sack, a lower garment. Here, at the very top, the receptive quality is pushed to a point where it produces violence rather than accord.
The line occupies the topmost place of the upper trigram Kun, with no line above it to answer to and no ruling seat beneath it to anchor its conduct, and Chinese commentary reads this placement as inherently unstable: pure yin, having risen through six lines to occupy a position of complete extremity, begins to behave like its opposite. The dragons themselves, a symbol associated throughout the tradition with yang force, appear here precisely because yin driven to its absolute limit meets and contends with the creative power it was never meant to rival directly.
The purple and yellow blood, neither the pure yellow of the fifth line's honored garment nor any single clean color, marks the wound as mutual rather than the triumph of either side. Commentary tradition reads this line as a warning that even the most yielding and receptive of qualities becomes dangerous when carried past its proper measure, since a virtue that will not stop at its own summit eventually collides with the very force it exists to complement, to the injury of both.