Identifying omission requires more than noticing that a sentence is short. Ask three questions:
1. What is absent? A particle, a word, a clause, or several clauses.
2. What supplies the clue? Syntax, preceding speech, idiom, or event sequence.
3. What is gained? Pace, avoidance of redundancy, attention to the central event, or another advantage.
«تَاللَّهِ تَفْتَأُ» provides a grammatical clue to an implied negative. «فَأَرْسِلُونِ ... يُوسُفُ أَيُّهَا الصِّدِّيقُ» relies on narrative context to supply intervening action.