On Jacksonville's first drive, he gave up a 29-yard catch on third-and-seven. Three plays later, Cecil Shorts got past him and caught a fade in the corner of the end zone to give the Jaguars the lead.
Amukamara came back on the next series and earned a bit of redemption, stripping Shorts on an end-around. Justin Tuck recovered the ball and the Giants' offense converted the turnover into seven points.
For Amukamara, it was a lesson in short-term memory.
"Right before that, Corey (Webster) and the other DBs just said, 'Forget about it -- short-term memory, short-term memory.' And that's what I did," Amukamara said. "It's great to start to develop that, especially in the NFL because there are going to be ups and downs. How you answer them is what matters."
Amukamara, who started in place of the injured Terrell Thomas, attributed the two catches against him to technique issues.
"It's just amazing how just a small technique problem can amount to a big thing," he said.
Head coach Tom Coughlin was disappointed with Amukamara's coverage on the first series but praised the second-year pro for his forced fumble. He said last year's first-round pick needs more time on the field.
"We need to put him in situations that he hasn't been too often, and it's the play-in-and-play-out, it's the ability to decode what the other guy is trying to do," Coughlin said in a conference call Saturday. "Have a sense and instinct about what's coming. That only comes with more time. He's another one that needs to play."
Safety Antrel Rolle said he and the defense warned Amukamara before the game that the Jaguars were going to test him. Rolle doesn't expect it to be the last time.
"As an offensive coordinator, that's probably going to be the angle. He has to understand that, and I'm sure he's aware of that," Rolle said. "You have to continue to grow. You have to turn into a man overnight. There's no time for babying, and he understands that. He's going to be fine. I have all the confidence in the world in Prince, and I'm sure he's going to get the job done."