Swearinger insists that he was playing according to league rules that mandate avoiding dangerous blows to the head.
"I was making a hit playing football. In this league, you've got to go low. If you go high, you're going to get a fine," Swearinger told Andrew Abramson of The Palm Beach Post. "I'm sorry that happened. I would think you'd rather have more concussions than leg injuries. Leg injury, you can't come back from that. A concussion, you be back in a couple of weeks."
To Swearinger's credit, he also took to Twitter to request prayers for Keller.
Keller's career-threatening knee injury has led to a debate on the merits of hitting high versus low, but it's unlikely to instigate a rule change. Now that the NFL has a more enlightened view of the long-term effects of brain trauma, there's no turning back on the emphasis toward the prevention of concussions.