Standing at 'Arafah and the ruling on leaving it

This message was received by the program from the citizen Sulayman Shami Ibrahim al-Qawzi from al-Qunfudhah. Our brother says: I am a Saudi citizen and I have performed Hajj, but there is a question that confuses me, and I want the honorable Shaykh to be generous in answering it: I stood on the plain of 'Arafah, and I was with a group of my relatives. I was afflicted with a severe illness in my feet, which made it impossible for me to stand on it due to the intensity of the pain. There was a volunteer near us calling out to the pilgrims that our standing was not in 'Arafah but outside of it. My group, who were with me, went to drag me along on foot, but I was unable to walk with them due to the severity of the pain. So is my Hajj valid or not? And if it is not, what should I do?
Answer: If you reached 'Arafah on the Day of 'Arafah or on the night of the Day of Sacrifice, even for a short time, then your Hajj is valid. If you came to it at night—the night of the Day of Sacrifice—then your Hajj is valid and you owe nothing. However, if you came to it during the day and did not remain in it until the setting of the sun, then you must sacrifice one animal, which is to be slaughtered in Makkah for the poor. This is because it is obligatory for one who is present in 'Arafah during the day after the 'Asr prayer to remain until the setting of the sun. If he departs before the setting of the sun, then he must offer a sacrificial animal to be slaughtered in Makkah for the poor. This is the answer regarding you, my brother! Yes.
The presenter: May Allah reward you with good.