5 minutes to go, and he was wobbling in the huddle. I thought he was just exhausted. Several others were clealry breathing hard. It appeared that that was part of why they dcouldn't go into hurry-up.
Excess nervous energy will exhaust you faster than anything. Maybe he had been feeling just too much pressure. Waiting around for all the pre-game cr*p to finish and the game to start is enough to exhaust anyone interested in actual football.
They did look tired out by then. McNabb wasn't sharp, but he had to carry the entire load himself -- no running game!! THAT is the real disappointment -- if the Eagles had a running game, the Pats couldn't have played those pass-only defenses.