لَا رَجُلَ قَائِمٌ
Translation: No man is standing.
لَا: particle of generic negation, whose ism is accusative in function and whose khabar is nominative.
رَجُلَ: singular indefinite ism lā, built on fatḥ, in the accusative position.
قَائِمٌ: nominative khabar lā, visible ḍamma.
The ism is built on fatḥ; the predicate remains nominative. Compare the earlier pattern in which the predicate was accusative.