Six at the top is a reading about a deadlock the querent built. Neither advance nor retreat is available, nothing is advantageous, and then the line turns on a single condition: acknowledge the difficulty and good fortune follows. That structure is rare in the classic, which usually attaches outcomes to conduct. Here it attaches one to seeing clearly, because conduct is precisely what the position no longer permits.
The commentary is blunt about the cause, tracing the jam to a want of care rather than to any outside force, and it limits the damage by saying the error will not be prolonged. Somebody drawing this line has usually pushed a thing to the point where every remaining option costs more than it returns, and the useful part of the reading is that the classic asks them neither to push harder nor to reverse. It asks them to stop misdescribing the situation to themselves.
When the line changes, the upper trigram Zhen becomes Li and the figure becomes Great Possession, King Wen 14, in which a single yielding line holds five strong ones by clarity rather than by force. That is the destination the acknowledgement opens onto. Strength which has run itself into a fence is not recovered by more strength, and what replaces it is the light the trigram Li stands for, the one thing this line was short of when the horns went in.