The Song of the Sea in the Vienna Scroll

 

A modern Torah scroll, c. 1780–1810; the Song of the Sea.

The Vienna Scroll, c. 1650s-60s

The Song of the Sea in Exodus has a special layout, which also occurs in the Song of Deborah in Judges.  Here is a summary of that layout:

They copied it in a special symmetric layout that resembles brickwork, with two blank spaces in the even lines and one blank space in the odd lines. This arrangement was chosen not only for its beauty but also for its meaning, with each of the spaces marking the end of a colon (a small poetic unit that must be sung in one breath). The importance of this brickwork layout is reflected in the fact that it is reproduced in every Torah scroll used in synagogues today. (A similar layout is required only for the Song of Deborah in Judges 5, another old and exceptionally beautiful poem.) - Paul Sanders

The Vienna Scroll follows this pattern. The MOB websites explains a common format for the last line:

The VS does not have this feature. The last two lines look like this:

Does this provide us with any hint at all of the origin of this scroll, or its ancestor scrolls?