أَمَّا تَرْكُهُ فَلِمَا مَرَّ فِي حَذْفِ الْمُسْنَدِ إِلَيْهِ
The reasons for omitting a predicate resemble the previously explained reasons for omitting the subject.
Here tark and ḥadhf should not be presented as two rigidly opposite technical categories. The issue is the deliberate non-expression of the predicate, whose grammar and rhetorical motivation must be examined separately.
In «زَيْدٌ مُنْطَلِقٌ وَعَمْرٌو», the predicate of ʿAmr can be understood as «مُنْطَلِقٌ». Not repeating it avoids useless repetition (iḥtirāz ʿan al-ʿabath). In other contexts the motive may be situational brevity, conventional usage, or choosing a stronger expression. The same motive must not be assigned automatically to every ellipsis.