Well, I did what I always do, stopped paying attention. I noted the pattern of leg decreases and proceeded to go forth, pausing only to check the number of stitches before the k2tog on each decrease row.
Doing so, I failed to see that from decrease row 6 onwards, the amount of rows between decreases is reduced.
I had just finished decrease row 10.
The green stitch marker shows the point at which the pattern is still correct. Needless to say, I am pretty bummed out. I am not finding the pattern hard so much as time consuming... and this setback isn't helping to cheer me up.
So, those who have made it past the ankle shaping: is there any way I can salvage this knitting? The sock still seems to conform well to the shape of my leg, though the decrease section doesn't curve as prettily as in the knitty picture. I am fairly resigned to ripping, but I thought I would ask your opinion first.