People are mentioning the green jerseys and I understand how that can be an advantage for the QBs, but on the other hand... there were times I felt like Martinez could have gotten away from them if it were tackle football but he had to stop becauae they touched him. And on those runs where no one touched him it was more impressive because they couldn't get a finger on him let alone get close enough to try to tackle him.
It's hard to say because the defenders are not bearing down on them as fast as they would be if they were trying to tackle them. I would say they are probably just going at about 75% speed to try and make the touch.