At the first stopping point, “sharak al-radā” gives a complete judgment about worldly life: it is a snare of ruin. The warning remains intelligible without the subsequent addition.
Sharak means a trap or snare, and radā denotes destruction. Their combination makes the world’s danger vivid in contrast to its apparent appeal.
If stopping at the earlier point left the grammatical or conceptual judgment incomplete, it would fail as the first rhyme of tashrīʿ. Here completion of meaning gives the stop its validity.