"Let Our Gladness Have No End"

Last month, I watched the Concordia University Wisconsin chapel service from the 11th, which had a lessons and carols sort of format.  One of the hymns was "Let Our Gladness Have No End," and I noticed a small feature in it.

The hymn is sung to the tune "Narodil se Kristus Pán."  Here's the second phrase:

In the first verse, the text here is "For to earth did Christ descend, alleluia!"  The first half of the phrase descends, giving a sense of the text's meaning.