Severus finished and lifted the stone bowl, setting it out of the way. He glanced back and forth between Theo and the pensieve before closing the cabinet door and turning back to face the other man.
"Yes, there is a limit on what one can do in a strictly theoretical sense, but at the same time in the absence of a teacher, they can also prove to be most... useful."
Severus paced across the room, stopping a few steps in front of Theo. With a deep breath he cleared the rest of his mind, feeling the last of his own mental barriers slip into place with a soft snick.