He got the pass off -- only to have Eugene Wilson intercept it and run it back for a touchdown on just the Jets' second offensive play of the game. And that wasn't the worst of it for Clemens.
When Seymour slammed him to the turf, Clemens landed on his arm and sustained what he called a rib injury. It was his only pass of the day; he did not return to the game.
Brad Smith, a receiver who serves as the fourth quarterback, replaced Clemens, but Chad Pennington took most of the snaps for the rest of the game. Pennington completed 25 of 38 passes for 186 yards, but he managed to drive the Jets (3-11) to a single field goal (they missed on another, after a touchdown catch was overturned on replay).
"I've been in this situation before, and what I have learned is that you have to prepare as the starter and understand you're not going to get the (snaps) in practice," Pennington said. "Once Kellen went down, I had to refocus my mind."
The Jets announced that Clemens probably would return, but he didn't.
"As we looked at it and we talked to the doctors, I thought it was best to continue on with Chad," coach Eric Mangini said. "When he was called on, he went in, and I thought he did a very good job."
Mangini would not commit to a starter for next week's game against the Tennessee Titans.
"I'll have to look at everything and evaluate it," he said. "We have the injury. We don't really have as much information now as we will have later on."
Pennington will be waiting.
"I prepare as hard as I can and do everything I'm supposed to do to be ready," he said. "And when I'm called on, I'll be ready."
Pennington started the season as the No. 1 quarterback, but he was benched in favor of Clemens after the Jets won just one of their first eight games. During practice last week, he portrayed Patriots quarterback Tom Brady for New York's scout team.
But when he hit the field at Gillette Stadium, he didn't play much like the two-time Super Bowl MVP at all.
"The first series or two, I felt weird because I hadn't had many reps," Pennington said. "You go from having no adrenaline to all of a sudden getting an adrenaline rush real quick. You can't play it lax, you can't play it not focused, you've got to have some intensity and some drive.
"If you don't, you're going to get hurt out there. So that's what's different from going from kind of being a spectator and doing everything you can from the sidelines and all of a sudden you've got to jump in there and start making some things happen."
Smith also came off the bench, taking nine snaps at quarterback. On the first down after replacing Clemens, the former college QB made a nice pitch to Leon Washington on an option play for a 49-yard pickup to the Patriots' 25 yard-line.
But Smith, working in a rotation with Pennington, also killed a down with a fumble and then threw an incompletion on fourth-and-2 from the New England 17 -- his only pass of the game.
Mangini said using Smith was a way to get around the line more quickly. That was part of the game plan whether it was Clemens or Pennington running the offense.
"You have a running/quarterback that can do a lot of things, and Pennington manages the game very well," Patriots linebacker Junior Seau said. "It was definitely keeping us off balance on the defensive side, but for the most part we hung in there."