يَا صَاحِبِي، تَعَالَ
O my companion, come here.
Yā is the most familiar vocative particle. In the textbook's original-distance classification it stands among particles for the remote addressee, although ordinary Arabic uses it freely for both near and far people.
The rhetorical point is not that every occurrence of yā reports spatial separation; it is how the speaker chooses to present the addressee. With a nearby person, yā may emphasize honor, seriousness, or the need to attract attention.