The fifth line is where Biting Through finds its standard. Legge's translation shows one gnawing dried flesh and coming upon yellow gold, then instructs the subject to be firm and correct while realising the peril of the position, after which there is no error. Yellow is the colour of the centre in the classical scheme of colours, and gold is the metal that neither corrodes nor bends, so the two together name exactly what a judgement should be: centred, and incorruptible.
The material is still dried flesh, so the work is still difficult, but the difficulty is no longer the subject of the line. What matters here is the quality of the one doing it. The text does not promise good fortune; it promises the absence of error, and it makes even that conditional on a clear sight of the danger involved. The danger is not physical. It is the danger of holding the power to punish, which corrupts quietly and from within.
A yin stroke stands in this odd place, incorrect by the letter of the rule, yet it is central in the upper trigram Li and it is the ruling line of the whole hexagram. Centrality overrides correctness here, as it does in several hexagrams whose ruler is a yielding stroke. A softness at the seat of judgement is not weakness in this reading. It is the quality that keeps a judge from enjoying the work, and it is why the gold found at this position stays yellow rather than turning to something harder.