The practical reading of hexagram 29 turns on the doubling. This is not one danger; it is the same danger arriving again, and the hexagram's counsel is shaped by that.
The received advice is to remain sincere, to keep the heart constant, and to move as water moves, filling each hollow before flowing on, never skipping a stage, never forcing a passage. The Image in the Ten Wings tells the superior person to keep their virtue constant and to practise the business of teaching, so that steadiness becomes habitual before it is needed. That is an argument about preparation rather than about response, and it is one of the more useful things the commentary contributes.
In practice the figure is read for a period of recurring difficulty in which the querent's situation is genuinely constrained. The characteristic error is trying to leap the obstacle. The characteristic correct action is filling the hole: doing the whole of the tedious thing in front of them before attempting to move.
The fourth line is the one most often quoted in reading, and it is oddly domestic: a jug of wine, a bowl of rice, earthenware vessels handed in simply through the window. Wilhelm reads it as an offering made without ceremony because ceremony is not possible. Whatever it originally recorded, it reads as a description of what people actually do for each other in a bad stretch, and it is the warmest passage in an otherwise bleak hexagram. Whether that warmth was intended or is something readers have supplied is exactly the kind of question this text does not answer.