"I Lie, O Lord, within Your Care"

Last year, I noticed a small feature in "I Lie, O Lord, within Your Care."  The first line of the third verse is "When shadows fall, I will not dwell" (the sense is completed by the following line:  "On troubles that distress me"), sung to this phrase from the tune "Ich liege, Herr, in deiner Hut":

"Shadows fall" is sung to a descending group of notes (D C Bb), so there's a musical sense of that "fall[ing]."