Hafiz Muhammad Ameen
(1) It has been mentioned repeatedly earlier that the Noble Prophet (sallallahu alayhi wa sallam) performed the entire Farewell Pilgrimage (Hajjat al-Wada‘) while mounted, so that people could observe him and learn the rites of Hajj, and also so that people could gaze upon him to their heart’s content. People had come from far and wide. In any case, there is no objection to going towards the Jamarat while riding, and moreover, you were coming from Muzdalifah.
(2) “Jamrah ‘Aqabah”: This is the last Jamrah if one is going from Mina to Makkah. In reality, this Jamrah is outside Mina, but it is adjacent to it. And this is the very Jamrah where the people of Madinah pledged allegiance at the blessed hand of the Messenger of Allah (sallallahu alayhi wa sallam)—both the first and the second pledges. On the Day of Sacrifice (Yawm al-Nahr), i.e., the 10th of Dhu al-Hijjah, only this Jamrah is pelted. It is also called the “Big Jamrah” (Jamrah al-Kubra). In common parlance, people sometimes refer to the Jamarat as “Shaytan” (Satan), but instead of this, it should be said that these Jamarat are not Shaytan, nor does Shaytan reside here; rather, they have been established as markers or signs at those locations where pebbles were thrown at him, because when Shaytan tried to prevent Ibrahim (alayhis salam) from his firm resolve, he repelled him by throwing pebbles at him. The stoning (rami) is a commemoration of this. This is confirmed by an authentic hadith. The Prophet (sallallahu alayhi wa sallam) said: When Ibrahim, the Friend of Allah, came to perform the rites of Hajj, Shaytan appeared before him at Jamrah ‘Aqabah. He threw seven pebbles at him until he sank into the earth. Then he appeared at the second Jamrah, and he again threw seven pebbles at him until he sank into the earth. Then he appeared before him at the third Jamrah, and he again threw seven pebbles at him until he sank into the earth. The narrator of the hadith, Ibn ‘Abbas (radi Allahu anhu), says: (Now it is as if) you are stoning Shaytan and following the religion of your father Ibrahim (alayhis salam). See: (Musnad Ahmad: 1/297, 298, and Sahih al-Targhib wa’l-Tarhib by al-Albani, hadith number: 1156)
(3) The person in the state of ihram may benefit from the shade of a tent or an umbrella, etc.
Source: Sunan Nasa'i: Translation and Benefits by Shaykh Hafiz Muhammad Amin Hafizullah, Page: 3062