
Continuity mistake: When R2-D2 closes the door to the platform in the back of the monastery (before Asajj attacks Ahsoka), Asajj stabs both of her lightsabers through the door, a few inches apart from each other, and starts moving them downward. In the next shot, on the other side of the door, there is already a solid line (the top of the circle) cut into the door. There wasn't enough time for her to have stopped and connected the space between the two holes. (00:45:40)
Answer: Both Jedi Knights and Jedi Masters can have Padawans apprenticed to them; the rank of Master is generally awarded once their first Padawan has successfully passed the trials and become a Knight themselves. While Ahsoka calls Anakin Master in formal circumstances, that's merely an indication of her status as his apprentice; Ahsoka being only his first Padawan, Anakin is still only a Jedi Knight.
Tailkinker ★