Mismatch: morphosyntax: pseudo-agent
The normal Bantu morphological passive is obsolescent. In its place, a generic 3rd person plural animate subject is marked on the verb. Nevertheless, the agent may still be overtly indicated as an adjunct (via the locative copula kuli), in the same way as with the original morphological passives:
morphological passive (obsolescent)
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newer passive substitute
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na-sum-uw-a | kuli | linoka | va-na-mu-vet-e | kuli | yayenyi | |
AUX-bitten[3SG.SBJ]-PASS-FV | at | snake.IIISG | 3PL.SBJ-AUX-3SG.OBJ-beat-FV | at | elder.brother.ISG | |
'He has been bitten by a snake.' | 'He has been beaten by his elder brother.' |
Thus, the subject marking in the second sentence is spurious, as the literal reading would be something along the lines of 'they have beaten him by his elder brother.'
References
Horton, A. E. 1949. A grammar of Luvale. Johannesburg: Witwatersrand University Press.