Consider three utterances in distinct circumstances:
1. زيد قائم — the listener merely needs a report about Zayd. This can be a plain predication, not necessarily an exclusive claim.
2. ما أنا فعلت هذا — someone has attributed an act to me; the utterance focuses on denying that attribution.
3. رجل جاءني — the listener expected a woman; the speaker corrects the person's kind.
The shared lesson is that fronting must be interpreted within the ongoing exchange. The latter two examples can have restrictive force, yet the thing restricted is not the same.