Harrison Smith is a throwback safety trying to figure out how to play a position that's increasingly foreign to him because of the NFL's zealous enforcement of rules against hitting offensive players in the head.

"The game has changed over time, for good or for bad," the Vikings second-year free safety said. "People talk about safeties that used to cause people to fear coming over the middle. Now, I don't think anyone fears coming over the middle because there are no consequences anymore. It's an offensive game. That's just how it's built."

As Smith prepared for Sunday's return from a turf-toe injury that sidelined him for eight weeks — he was activated Saturday — he and everyone else saw what has been discussed all week as a classic example of the ugly flip side of conditioning defensive backs to hit low.

A week ago, Patriots tight end Rob Gronkowski caught a pass down the middle of the field and took a hard, direct shot to the right knee from Browns safety T.J. Ward. A day later, ESPN reported that Gronkowski was the 41st player put on season-ending injured reserve because of an anterior cruciate ligament injury. With three weeks left in the season, that's already a 64 percent increase over 2011 (25).

"I'd say right now that Gronkowski would rather get hit in the head," Vikings defensive end Jared Allen said. "Officials are going to err on the side of caution. That's fine. But the other alternative is you take someone's knees out."

Smith called the decision Ward had to make on that tackle "kind of a no-win situation." The rules say don't hit high, but an unwritten rule among players is to avoid direct attacks on the knees.

"People say, 'Oh, you can hit him in the middle,' " Smith said. "But it's kind of hard to control when you're trying to get the guy on the ground."

Smith said he finally relented and worked on lowering his target area after a couple of fines and penalties last season.

"And there were a couple of times where I hit guys not even at the knees, but the hip area, and they got up saying, 'Man, why do you have to hit me low?' " Smith said. "And it's like, 'I hit you where they told me to. I don't know where else to hit you.' "

Smith said he understands the safety aspect as the league attempts to prevent head injuries and the potential long-term problems that come with them. But he also wishes he could play the position like Ronnie Lott and Steve Atwater, two of his hard-hitting idols from a different era.

"I just like old-school football," Smith said. "They can make all these rules, but a coach once told me, 'It's a violent game played by violent individuals.' Injuries are going to happen. It's part of the game."

Three observations …

• Players routinely complain about playing on Thursdays. And, frankly, they make a good point that the league is more concerned about making money than player safety when it comes to Thursday games. But with all this complaining, you'd think the home team would be dominating on Thursdays. Not exactly. The Chargers' upset in Denver this week gave the road teams a 7-10 record this season.

• Chargers receiver Keenan Allen caught only two balls Thursday night, but he no doubt shot to the front of the NFL Offensive Rookie of the Year race because both catches were highlight-reel touchdowns.

Allen leads all rookie receivers with seven touchdowns.

• Robert Griffin III will be fine once again when he's paired with a coach who isn't at a point in his career where he's just plain sick and tired of coaching football and dealing with the media.

Two predictions …

• Talk about messing up your draft status. Once 0-8, the Jacksonville Jaguars are about to beat the Buffalo Bills for their fourth consecutive victory and fifth in six games.

• New England will win at Miami because, well, the Patriots are the only team that consistently does what it's supposed to do. At least in the regular season.