1)
What does the Torah mean when it states that the magicians were not able to stand before Moshe?
1.
Ramban: It means (not that they could not be summoned to the palace [Refer to 8:15:1:2*] but) that, due to the great embarrassment of being covered with boils, 1 they closeted themselves in their homes, in order to avoid being seen by Moshe either in the palace or even in the street.
2.
Hadar Zekenim (on Pasuk 8): Moshe was esteemed in their eyes and they would have stood before him, but boils are often on the knees and thighs, so they were unable to stand.
1
Ramban: Inasmuch as they were nott even able to cure themselves.