Should've stayed longer....(chronicle)

We were seated at the table right by the top of the staircase. Famished, we devoured our food within minutes. We sat and chatted, joking around and laughing about everything and anything. Good times. Just as B rose from his seat as we were leaving, I saw him. He was sitting in the company of, I would assume, two other friends. As I approached the top of the stairs, I turned back to check whether I'd left anything behind. That's when it happened...