He moved on from Muzdalifah to Makkah and did sa‘i, but he delayed tawaaf al-ifaadah so that he could combine it with tawaaf al-wadaa‘
Question

                A man did Hajj with his parents, doing ifraad (Hajj on its own, without ‘umrah). They went straight to ‘Arafah and stayed overnight in Muzdalifah, but on the day of ‘Eid they went to Makkah and did sa‘i of Hajj, but they did not do tawaaf al-ifaadah, so that they could combine it with the farewell tawaaf (tawaaf al-wadaa‘), because of his parents’ physical weakness. Then they shaved their heads, then they exited ihram, out of ignorance, then they stoned Jamrat al-‘Aqabah on the day of ‘Eid. Do they have to do anything further?
Praise be to Allah.
    There is nothing wrong with that. If a man 
    enters ihram for ifraad (Hajj on its own) or qiraan (‘umrah followed by 
    Hajj, without exiting ihram in between), and he goes out to ‘Arafah and 
    stays there, then goes to Muzdalifah, then comes to Mina, and goes to Makkah 
    and does the sa‘i of Hajj, and delays tawaaf until he is about to leave, 
    there is nothing wrong with that. But this man exited ihram before stoning 
    the Jamrah. If he did that out of ignorance, then he does not have to do 
    anything further. End quote.