1)
Why did he go to Sha'ar ha'Ayin?
1.
Rashi: It is one of the breaches.
2.
Malbim: It is in the south 1 (3:15).
1
Malbim (13) explained that he left his house and headed to the south. (PF)
2)
Why does it say that there was no room for an animal to go under him?
1.
Rashi: He could not go through while riding, for they are small breaches. Malbim ? therefore, he descended from the animal and walked.
2.
Ibn Ezra: The words should be rearranged, to say Ein Makom la'Behemah Asher Tachtai La'avor.


