What does the Professor remember about his last day at his apartment in the story, Lemon Pie?

The Professor remembers he had just slept with another teacher, was hungover, and “didn’t even glance at the Styrofoam box of leftover lemon pie from the French bakery” (30-31) on his way to school. The Professor continues to remember the day he was captured, realizing “it’s hard to know at what point it became What Happened” (33) as opposed to just another day. He remembers being pulled over by soldiers, and taken away.