In this form, bāʾ accompanies the extracted figure and conveys an associated presence. The rhetoric suggests that the original bearer possesses the characteristic so powerfully that a second bearer or embodiment of it accompanies him.
وَشَوْهَاءَ ... تَعْدُو بِي إِلَى صَارِخِ الْوَغَى
And a battle-worn mare that races with me toward a caller in the fighting.
The bāʾ in “bī” conveys accompaniment. The poet portrays his readiness for battle through an imagined further self or companion similarly equipped for the encounter. In this analysis bāʾ is not merely a transitive verbal marker.
This differs from “bihi al-baḥr,” in which bāʾ accompanies the original man. The distinction depends on attachment and the intended conception, not on the particle's spelling alone.