1. Final sitting omitted, no fifth prostration: return and perform sujud al-sahw.
2. Final sitting omitted, fifth prostration done: fard is not valid; the prayer counts as nafl, so a sixth is added.
3. Final sitting completed, no fifth prostration: return, say salam and make sujud al-sahw.
4. Final sitting completed, fifth prostration done: add a sixth; four fard are completed and the extra two are nafl.
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Prostrations of Forgetfulness: Causes, Method, Missed Sittings and Doubts
1. Final sitting omitted, no fifth prostration: return and perform sujud al-sahw.
2. Final sitting omitted, fifth prostration done: fard is not valid; the prayer counts as nafl, so a sixth is added.
3. Final sitting completed, no fifth prostration: return, say salam and make sujud al-sahw.
4. Final sitting completed, fifth prostration done: add a sixth; four fard are completed and the extra two are nafl.