Sophia stopped as Professor King did, frowning a bit at his words. She had not always been so indecisive, she used to be sure of everything. But, alas, many things had changed for Sophia since her arrival at Hogwarts. With a nod to the Professor she turned to look at the wall, staring at it for a few moments before turning on her heel and walking down the hallway.
Once she had walked a few feet down the hallway Sophia turned around and walked back toward Professor King, thinking to herself, I need a place where I can improve my skills in defensive magic with the help of Professor King. She passed Professor King and turned around, walking back down the hallway with the same thought in her head. Once she got to the spot she had been in at the start of her pass she turned around and walked past Professor King once more, the same thought in her head as the previous two times.
After passing the spot on the wall the third time a large wooden door appeared and Sophia stopped. She turned to Professor King with a slight smirk on her face. "After you Professor."