When the snap came, the yellow can rushed, but Johnson was looking at the gray can and was late to block the linebacker.
"What are you looking at?" Stoutland barked at the top draft pick. "I knew I'd get you!"
Welcome to Johnson's world. The rookie is only two days into training camp and he's probably made more mistakes than he had his entire senior season at Oklahoma. It has been Stoutland's job to remind him of that.
The former Alabama coach is primarily responsible for preparing Johnson for the NFL, and if all goes according to plan, to start at right tackle from Day 1. But Stoutland is just at the top - along with, of course, head coach Chip Kelly - of a pyramid of support.
It's quite the cast. Johnson has not only Stoutland but former Eagles Pro Bowl tackle Tra Thomas, now a coaching intern, one of the game's best tackles in Jason Peters, and the rookie's predecessor at right tackle, Todd Herremans, to aid his development.
Stoutland, though, will take the lead. When he was asked about his new coach's methods, Johnson couldn't help but smirk.
"He'll get in your face sometimes, but he's fun," Johnson said Wednesday at the NovaCare Complex. "He's really fun. He has a lot of energy . . . that he brings to the players."
Johnson, a former quarterback and tight end, has only two years experience at tackle. His athleticism is off the charts and already evident on the field, even during mundane drills. But improving his technique will be the biggest challenge.
"I feel fine," Johnson said. "I feel like I'm progressing well, just keeping my feet in the ground and using my hands until I get a lot better with my hands."
Jason Kelce, who started at center as a rookie, said that Johnson was "progressing extremely well," but noted that he was still green - as he should be.
"You're so new and you don't know things very well, and you're trying to learn everything mentally that you're doing too much thinking," Kelce said. "When the reality is, you should just go out and play. We'd rather have [Johnson] . . . go full out and blow somebody up, and if he's got the wrong guy we can correct that."
Understanding blocking assignments should come naturally, but it's going to take some time. NFL defenses are adept at disguising their pass rush and the rushers Johnson will have to fend off won't be color-coded trash cans.
"Especially when you're going from team to team and they have different game plans," Johnson said.
He'll get plenty of help in both the technique and assignment department. Thomas was a rock for the Eagles at left tackle for 11 seasons. He didn't have Johnson's athleticism, and wasn't the greatest run blocker, but he was as fundamentally sound in pass protection as any tackle.
"He's played the position," Johnson said. "There's nobody better to learn from than him and Jason Peters."
Peters, who went to five straight Pro Bowls before he ruptured his right Achilles tendon last year, will report to camp, along with Herremans and the rest of the veterans, on Thursday. Herremans, moved back to guard after Johnson was drafted fourth overall, has been supportive of the decision.
"Playing with [Herremans] during the spring - most times I knew what was happening, but sometimes if I had a question, then I'd just bump him and he'd tell me what to do," Johnson said. "He's a very intelligent player and has always known what to do. It makes me a lot more confident playing next to him."
Because of low numbers, Johnson was at left tackle and undrafted rookie Matt Tobin was to his right on Wednesday. After Stoutland's critique of Johnson, he lowered his voice and explained to both linemen how the play should be blocked.
And then they did it again. And did it right.
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