— LeSean McCoy is way less sure what to make of the NFL's controversial new rule change than what to expect from Chip Kelly's mysterious but potentially exciting new offense.

Nevertheless, the veteran Philadelphia Eagles running back, at Lancaster's Clipper Magazine Stadium on Wednesday evening to promote his second annual celebrity softball game, must find a way to make both work for him in the 2013 season.

In the latest move to cut down on head injuries and prevent future litigation, the league a few hours earlier had voted almost unanimously at the owners' meetings in Phoenix to prohibit ballcarriers or tacklers from initiating contact with the top of their helmet in the open field.

Although the new rule helps defenders who previously faced an almost impossible task of bringing ballcarriers down without penalties and fines in those situations, it goes against both instinct and everything all running backs have been taught since they put on helmets for the first time.

"The biggest thing is bracing for hits," McCoy said. "I think it's natural, when the defender is coming, to brace for the hit by lowering your pads. I don't know. You've got to get used to it. That's a rule that I'm not really familiar with at all.

"I'm thinking of short yardage and things like that. I'm not sure it's going to work, because players tend to play low. When tacklers are coming, you want to have some leverage and your head naturally comes down, so I don't know how it's going to play out. I'm really surprised by this."

McCoy's first choice is to make defenders miss, but he's not above lowering his shoulder, which of course is attached to his head. Now he and everyone else must change their basic, fundamental approach to become law-abiding citizens in a mutated universe ruled by owners whose every move now is seemingly guided by a series of pending, class-action concussion lawsuits filed by former players.

As puzzled as McCoy is about the new rule, he is thrilled and energized to go to work for Kelly, who was named the team's new head coach two months ago.

"I like him, I like him a lot," McCoy said. "He's a college guy, but it seems like he has that NFL thing, that kind of swagger. His football swagger kind of fits the team, all the younger players we have that are talented and feel a certain way about their game.