As the rest of us turned to Zombies he remained calm, focused and sharp. Without him, we wouldn't have shipped as well as we did.
However, the people in management/business made some sweeping remarks about our team "not working as hard as the other teams" in passing. Makes me think that the further away from the code and actual productivity you are, the more important hours and arbitrary productivity measures become.
In any case, you've provided a nice example of how issues like working hours are subsumed by team dynamics. That's where action is.