So I've been mulling over something that happened over the weekend, but I think I'm a little too personally involved to make a fair decision, so I'm turning to you folks.
I was playing in a tournament at a store that was simultaneously running a Magic: the Gathering tournament. During one of the games, my opponent looks away from the board and says "I don't want to rush you, but we do only have 10 minutes left in the round." I follow his gaze to the clock to confirm, because I hadn't realized we were so close to the end of the round. I begin playing with the time limit at the front of my mind. In those 10 minutes, my opponent is able to claim victory with less than a minute on the clock. As I start to pack up, I look at the time clock and notice that the clock that is now at "00:00" is the clock for the M:tG event, we still had another 10 minutes on the X-Wing clock. Nobody at the event knew how to resolve this, and I ended up taking the loss anyway because I didn't want to stall out the whole event.
I'm certain that my opponent made an honest mistake when he pointed out the wrong clock, but it is still a misrepresentation of one of the factors that make up the board state. At the same time, I also didn't notice which clock was assigned to which game, and took his word that it was 10 minutes without bothering to verify for myself. How would you have handled this, or is there an official ruling for situations like these?