"Now Rest beneath Night's Shadow"

Last year, I noticed a couple small features in "Now Rest beneath Night's Shadow," sung to the tune "O Welt, ich muss dich lassen."  Here's the second musical phrase, which is also repeated as the fifth musical phrase:

In the fourth verse, the text sung to the second phrase is "Now spread Your wings above me," and the text sung to the fifth phrase is "Let angel guards sing o'er me."  In both of these, the musical pitches mirror the positions:  "wings" and "guards" (both sung to Gs) are above "me" (sung to an E both times).