In Doctor Strange, Kaecilius goes in person to Kamar-Taj to steal pages from the book that contained a ritual.
Why didn't he simply use the teleport spell to teleport directly inside the library and get all the books he wanted?
He could have done it while the library protector was asleep. He could have avoided being caught and circumvented an unnecessary chase between him and the ancient one.
Also, later in the movie, Strange himself does that to get some books while Wong is distracted.