Karen smiles at me. Motioning for me to sit, I shake my head. "I'm going to buy my lunch... see you in a bit?" She nods silently, her eyes twisting to the right, which was behind me. I turn, but only for a second, and don't see anything.      I make my way through the crowd of students to the little kitchen where they served the food. My eyes survey the selections, hesitantly grabbing a sala…