When Tip released Dorothy...
I think it was Glinda disguised as Tip. She didn't want West torturing secrets out of Dorothy. Secrets she shared with East.
The episode heavily featured disguises and masks. Even West herself used a body changing spell to disguise herself as Karen Chapman. Speaking of which, how did she know what Dorothy's mother looked like? Did she just make a spell to look like the whatever person Dorothy thinks of as her biological mother? Did the spell actually change her physical appearance, or just create an illusion in Dorothy's mind? What do you all think?