The third line is the one place in Holding Together where the hexagram's central good, union itself, produces harm. Legge's translation shows the subject seeking union with those who ought not to be associated with, and the small commentary appended to it asks, plainly, whether such a person will not suffer injury. The line offers no counsel and names no remedy. It reports a bond formed without discernment and leaves the consequence as a question that answers itself.
Yielding in an odd position at the top of the lower trigram Kun, this line is incorrectly placed and has no correct partner above it. The sixth line, which would ordinarily be its correspondent, is also yielding, so the reach upward finds nothing firm to hold. What remains within range are the soft lines immediately beside it, and it is that proximity, rather than any suitability, that settles the company it keeps.
The placement makes the failure structural before it is ever moral. Holding Together does not ask whether a person wants to belong; it assumes they do. What the third line adds is that wanting to belong, unaccompanied by judgment about whom one belongs to, turns the hexagram's virtue into its own defect. Union with the wrong people is not a lesser version of union. In this figure it is worse than standing apart, because it commits the whole weight of attachment to something that cannot bear it.