: Outdoor practice fields: ShellsIt's becoming increasingly clear, as Oregon football's 2018 preseason camp progresses, that when first-year coachtalks of the new culture he's been working to instill, a key tenet is discipline.The 2017 Ducks lacked it in key ways, most notably penalties. No team in the country drew more flags on average (9.4), nor for more yards per game (88.3). For a program whose margin for error isn't yet back to where it was a few years ago, that's a killer.As the Ducks have done in years past, Cristobal has invited an officiating crew to attend practice and throw flags when appropriate. They did so for the first time this preseason Sunday, the Ducks' first day in shells so far. But Cristobal is taking things a step further, inviting those officials into the Hatfield-Dowlin Complex to review film, and offer more feedback on the Ducks' discipline."You have to face that dead-on," Cristobal said Sunday afternoon, when Oregon hosted its annual preseason media day in The Club at Autzen Stadium. "You're either teaching it, or you're allowing it to happen. And we allowed it to happen."The offensive line and secondary generally have been the most consistent offenders. On Sunday, 1-on-1 pass drills featured maybe a half-dozen flags for holding or pass interference; Cristobal said there were three total flags on the offensive line, two for illegal procedure and one for holding — and that was too many, he said.Another way the staff is instilling discipline is through accountability for assignments. Anecdotally, the last three days seem to have featured more frequent instances of coaches subbing out a player mid-series in the event of a mental error — a center having an errant snap, or a receiver struggling to get lined up pre-snap.In the post-practice huddle, Cristobal reassured the Ducks that's to their long-term benefit, which he re-stated shortly after at media day."We're not going to break you; that's not the point of fall camp," the coach said. "We're going to make you, and break bad habits."There were some positive signs on the discipline front, too. Since taking over the program, Cristobal has preached a "practice like pros" mentality. That means playing with a physical style, without subjectign each other to the risk of injury but taking each other to the ground.On Sunday, he told them, "we did a much better job of staying up, and that's good.": After a day Saturday when their timing seemed a little off,andwere really sharp Sunday. In the final team period of the day,got a step ondown the sideline and was gone. Prior to that in 7-on-7, another receiver couldn't haul in a pass but tipped it into the air, and Johnson managed to haul it in while tapping both feet inbounds before falling to the sideline. … Lenoir and Johnson had a couple good battles in 1-on-1. First, Johnson tried to get physical off the line but Lenoir fought him off and broke up a pass. Later, the cornerback again had tight coverage but the pass somehow eluded his reach and Johnson hauled it in. … Walk-on safetynearly had a great pass breakup in 1-on-1s, but unfortunately for him the ball hung up in the air, andhauled it in. …Mitchell and Johnson also set the tone in a perimeter blocking and tackling drills between the receivers and DBs. Reps between Haki Woods and, and laterand, showed that the freshman receivers have a little to learn from the vets in terms of blocking. … In the 1-on-1 period, Woods got physical again, this time with, and forced an incompletion. … During a team period,had a nice completion followed by a rep on which he handled a high snap but still got the handoff toin time for a long gain. …popped Sunday a few times. On three straight reps during one team period, he was the first defender to get to running back, and in the ensuing 7on-7 drill he broke up a pass fromto. … Another true freshman safety,, continues to impress as a playmaker. After interceptions each of the first two days, he ripped the ball out for a forced fumble today, thoughbailed out a teammate by jumping on it for the offense. …andboth broke free for long runs in the 7-on-7 run drill.With the team in shells, the first period of the day was a tackling drill, including for quarterbacks. Nothing full contact, just work on proper technique; "see what you hit" was the constant refrain from coaches. … At media day, Cristobal said Addison isn't the only potential two-way player this season. Sophomore receiverhas potential as a nickel defender, he said, and a defensive lineman or two could factor into a goal-line package on offense. … Cristobal said he leaned heavily on his starting five offensive linemen last season under direction from the head coach; now that he's in charge, he plans to use a rotation closer to eight or nine guys, he said. …Sophomore safetyreported for camp after missing a couple days following the birth of his child. … Freshman offensive lineman, who opened camp at right tackle, got some reps at left guard. … Special teams drills focused on the punt team for the third day in a row. The other units will get some attention the next couple days. … Former quarterback and Eugene nativeattended practice.: Tight end Jake Breeland (background) is 6-foot-5 and 248 pounds. Outside linebacker(right) is 6-4, 217. And then there's true freshman offensive linemanHead coachJunior linebackerJunior quarterback: The Ducks are back in shells Monday morning, before donning full pads for the first time Tuesday.