An independent new address, or two unrelated participants named by different pronouns, is not necessarily technical iltifāt. Discourse continuity, identifiable reference and a departure from the expected form must be established.
«إِيَّاكَ نَعْبُدُ» is direct address in isolation; its role as a shift emerges only against the earlier third-person phrasing. Likewise, «وَجَرَيْنَ بِهِمْ» can be classified properly only after attending to the preceding «كُنْتُمْ».
A sound analysis therefore states three things: the starting person, the destination person, and the rhetorical benefit of moving between them.