Vikings linebacker Chad Greenway had no issues with the personal foul penalty he drew with 11:58 to play Sunday when he delivered a jarring shot to Lions receiver Calvin Johnson over the middle. Greenway tried to pull up at the last second, but couldn't and was hit with a flag after his shoulder made contact with the defenseless Johnson's head. In addition to the 15-yard penalty, a hefty fine is likely coming Greenway's way as well. And he's OK with that. As for the Vikings' other personal foul penalty? Well, let's just say Leslie Frazier isn't ready to accept the referees' judgment that cornerback Josh Robinson was guilty of unnecessary roughness when he delivered a hard tackle on Nate Burleson after a 6-yard Detroit completion late in the first half. Robinson actually body slammed Burleson to the Ford Field turf. And yes, it was a hard tackle but didn't seem to be outside the rules. Which is why Frazier plans to ask the league for further explanation on why a flag was thrown. "That's one of those we will send into the league and get some clarification on," Frazier said. Like many Vikings fans who screamed at their TV set when Robinson was flagged, Frazier was mystified by the call and doesn't know that he would coach his rookie corner to do anything differently on that play. "Seemed like a tackle—just seemed like a tackle," Frazier said. "Now [it was] a hard tackle. But it is football. So we are going to get some clarification from the league. ... I have never seen anything written that we couldn't tackle a guy that way. So I am interested what the league has to say."
In other news:

  • On the injury front, Frazier revealed that receiver Michael Jenkins suffered bruised ribs Sunday but should be OK going forward.
  • Linebacker Erin Henderson, who has sat out the past two games, has still not been cleared to return to practice after suffering a concussion. In Henderson's place, Jasper Brinkley has taken on a heightened role in the Vikings' nickel defense and has performed so well that Frazier said he might consider keeping him in that role even when Henderson is healthy again. "He did a good job yesterday against a high-powered passing offense," Frazier said. "So we'll have to take a real hard look at where he is in the passing game and where Erin would be when he comes back."
  • Frazier also had high praise for nose tackle Letroy Guion, who has taken his game to a new level in the Vikings' 3-1 start. Said his head coach: "He's become so much more professional about his work and his approach to work. We talked a lot during the offseason. He's really worked to show his teammates, along with our staff, that he was taking his job more seriously. He was awarded a contract [as a free agent] in the offseason. He was very grateful for that. And I expressed to him the way to show your gratitude is to be a pro about your business, about what you have to do on the football field. He's spent a lot more time in the classroom, studying and preparing for opponents. It's showing up on the field. He's playing exceptionally well for us. But he's taken his game to another level as far as his preparation. He's had the physical tools. Now he's becoming a student of the game."