He's sitting by the window, playing his violin when Darren walks in the door. He picked up the instrument because he said it was a classic for a detective.

The groceries in Darren’s hands hit the floor. His knees go weak and he very nearly hits the floor as well. He only just manages to make it over to the sofa. Through it all, Tobias continues to play, drawing the bow back and forth steadily, never taking his eyes off of Darren even as the sweet sounds of Darren’s favorite music pour steadily from the freshly dusted instrument.