PHILADELPHIA -- It was the run-run-reach that derailed Nick Foles.

One Mississippi. Option No. 1, covered. Two Mississippi. Pump fake to try to shake the defender, unsuccessful. Three Missis ... Bam!

Sack, Chris Clemons. Strip, Chris Clemons. Fumble, Nick Foles. Recovery, Ryan Davis. Turnover.

Nick Foles was besieged by Jacksonville's defensive line in Week 1, something he rarely faced in 2013. Eric Hartline/USA TODAY Sports

Not Nick Foles. Not Mr. Reliable. Not the quarterback who threw just two interceptions and lost three fumbles in 10 regular-season starts last season for the Philadelphia Eagles.

Oh, no.

There was more, and it wasn't pretty. The entire first half against Jacksonville in Week 1 was, to be polite, a train wreck for Foles. The first drive of the season ended with veteran defensive end Clemons' strip sack. Clemons plowed head on into Foles, contacting the quarterback's right arm as he began to throw.

On the Eagles' second drive, Jaguars defensive end Andre Branch caught Foles from behind after Foles looked to his first, second and third options and then back across the field. Branch swatted at Foles' hand, and the ball popped out. Jaguars defensive tackle Ziggy Hood fell on it. Turnover No. 2.

The next three drives produced three punts and only two first downs. Then, with the Eagles trailing 17-0 but sitting at the Jacksonville 5-yard line, Foles fired a pass to tight end Brent Celek in the end zone that was picked off by Jaguars cornerback Alan Ball. Turnover No. 3.

Six possessions. Three turnovers. Was that the real Nick Foles?

When the sample size is just 17 career regular-season starts for a quarterback who was a third-round draft pick in 2012 -- the 88th overall pick, no less -- it's legitimate to question who he is as a player.

Is Foles the efficient ball protector who threw 27 touchdowns last season? Is he the guy who became the seventh player in NFL history to throw seven touchdown passes in a game -- and the first to do so with a perfect quarterback rating of 158.3? Does he really deserve to have his jersey hanging in the Pro Football Hall of Fame next to Peyton Manning's? Should he be mentioned in the same breath as Aaron Rodgers, Manning and Tom Brady, who hold the four highest single-season passer ratings in NFL history, with Foles checking in at No. 3 with his 119.2 rating last season?

The answer isn't sexy: Maybe.

"I think he's legit," one AFC general manager said. "I like him. But, Chip Kelly has taken average quarterbacks and won with them before."

"He's got talent," said an NFC defensive coordinator whose team will face the Eagles later this season. "He's big. He doesn't make a lot of mistakes. But for as fast as they like to run, he doesn't always make the quickest decisions."

Which is where run-run-reach came into play.

In watching film from last season, the Jaguars saw what others have seen: Foles has a tendency to hold on to the ball too long. When he has to go through his progressions and find second or third reads, he can be hesitant, which leads to sacks.

The Jaguars thought if they could play solid zone coverage against the Eagles, their pass-rushers could get to Foles, which is exactly what happened in the first half.

"We knew if we started fast, he'd hold on to the ball a little bit, because they run long-developing routes," Clemons said. "We knew if we could get to him, we'd go for what we call the run-run-reach, which is coming from behind and swiping the ball. When they can't see you, it's easy."

Greg Cosell, executive producer of ESPN's "NFL Matchup" show, has watched every snap Foles has taken as a pro. Cosell said the Eagles faced man coverage last season primarily from defenses that reacted to Philadelphia's tempo. Cosell expects that teams will emulate what the New Orleans Saints did in a playoff win at Philadelphia in January and what Jacksonville did in Week 1: be more proactive and aggressive, particularly if the Eagles continue to have issues on their offensive line.

Last season, the Eagles' starting offensive line of left tackle Jason Peters, left guard Evan Mathis, center Jason Kelce, right guard Todd Herremans and right tackle Lane Johnson started all 16 games and played 98.3 percent of the offensive snaps together. Kelce is one of the top centers in the game, and Peters is considered by many to be the most technically sound tackle in the league.

This season, Johnson is serving a four-game suspension for violating the NFL's policy on performance-enhancing drugs. His replacement, Allen Barbre, suffered an ankle injury against the Jaguars and is now on season-ending injured reserve. Mathis sprained his MCL against Jacksonville and is on IR but designated to return in late October at the earliest.

That means, in all likelihood, that Foles will have even less time in the pocket. Plays will have to develop much more quickly.

"I think he has a tendency not to see things clearly," Cosell said. "When he doesn't see things clearly, he holds the ball. Because he's not a quick-twitch athlete, he doesn't look good when he's in the pocket for longer periods of time. I think he ultimately needs the system to help him play.

"Do I think Nick Foles will ever be an Andrew Luck or Aaron Rodgers? No. Can he be a successful quarterback? Absolutely."

The RB-QB tandem of LeSean McCoy and Foles has reinvigorated the Philly fan base. Rich Schultz /Getty Images

"Who is Nick Foles?" That was the headline on a Philadelphia Magazine profile of Foles this summer. "Bland Ambition" was the headline for a Philadelphia Inquirer column on Foles.

That Foles is relatively unknown to the public and perceived as boring is by design. Foles is a private guy.

He grew up in Austin, Texas, and played football and basketball at Westlake High School, Drew Brees' alma mater. Foles went to Michigan State but was buried on the depth chart behind Brian Hoyer, with a redshirt named Kirk Cousins waiting in the wings. After Foles' freshman year, he transferred to Arizona and started for 2½ seasons.

Former Eagles offensive coordinator Marty Mornhinweg fell in love with Foles in college and convinced then-Eagles coach Andy Reid to draft Foles in 2012. Foles started six games late that season before breaking his right hand in the next-to-last game against Washington.

After Chip Kelly became Philadelphia's head coach in 2013, Foles competed for the starting job with Michael Vick, eventually losing the competition in training camp. But he became the starter after Vick injured a hamstring in Week 5 against the New York Giants and remained in that role the rest of the season.