Never is the most likely answer. I do not have good instincts for when to stop “business as usual” in my knitting and head to bind-off. It turns out that the right time to change what I was doing on my Waterlily shawl was a while ago. Maybe after the first row of snowflakes in the green.
Now these snowflakes are stockinette (with yarnovers) on a garter background. So they don’t roll too badly. It’s possible that I can just remove the half bind-off, tink one more row and recommence bindoff. If will be right after the end of the motif, though. Not sure how it will look. Or I could remove the second row of snowflakes and put in several rows of plain garter stitch.
For tonight, I think I’m going to go back to my Petit-four second sock. I think I’ve got all the little bits of windshield glass out of it. Oh, well, there are just days like this. And I certainly brought it on myself!