The ruling on one who becomes in a state of ritual impurity during the tawaf of departure and completes it while in that state

The questioner:
Honorable Shaykh, may Allah grant you success. A questioner says: My father became in a state of ritual impurity during the tawaf of departure in the second lap. He is advanced in age, and it is difficult for him to go out to perform the ablution for prayer. So he completed his tawaf while in a state of ritual impurity. He asks: What is the ruling on his Hajj now?

The Shaykh:
How?

The questioner:
He says: My father became in a state of ritual impurity during the tawaf of departure in the second lap. He is advanced in age, and it is difficult for him to go out to perform the ablution for prayer. So he completed his tawaf while in a state of ritual impurity. He asks: What is the ruling on his Hajj given this situation?

The Shaykh:
And despite performing dry ablution with clean earth, it is difficult for him to go out, and he did not perform dry ablution with clean earth by striking the ground with his hands and wiping his face and palms. So he erred in this; he should have performed dry ablution with clean earth.