Every week someone in the NFL ends up red-faced for not knowing the rules.

In Week 2, Steelers rookie returner Kaleb Johnson allowed a kickoff to roll into the end zone, where the Seattle Seahawks recovered for a touchdown that propelled them in a 31-17 victory over Pittsburgh on Sunday.

It appeared Johnson didn’t understand the ever-changing kickoff rules that make a football that lands in the landing zone a live ball that anyone can recover if the returner doesn’t corral it.

“Poor judgment by a young player,” Steelers coach Mike Tomlin said.

Here’s the thing: it doesn’t take a novice to make a rookie mistake.

In the Denver Broncos’ 29-28 loss at Indianapolis , a leverage penalty on a missed 60-yard field goal led to a successful do-over from 45 yards. Both coaches acknowledged M

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