A pronoun (ḍamīr) identifies the subject through its relation to speech: speaker, addressee or third person. “أنا” (I), “أنت” (you), and “هو” (he) differ in viewpoint and communicative involvement, not just in vocabulary.
أنا حاضرٌ — I am present.
أنت حاضرٌ — You are present.
هو حاضرٌ — He is present.
Ordinarily “you” addresses an identifiable hearer. Rhetorical usage may extend direct address to any imagined observer, drawing the audience into the scene rather than merely reporting about it.