It sounds like they're just trying to give him some reasonable excuse, but the below is from Jaguars.com.

 

<b>3.Plausible explanation. </b> It was beyond question of the stranger plays you’ll ever see: Jaguars running back Bernard Pierce, while covering a Jaguars punt, turned and blocked a Buccaneers blocker as Buccaneers returner Bobby Rainey ran past on a 58-yard return. The miscue has gone viral on social media, and prompted many fans to call for Pierce’s release. “It’s not a good play at all,” Bradley said. “When I saw it I couldn’t believe it.” Pierce, who did not play in the second half because of a hamstring issue, after the game reported having concussion symptoms and is now in the NFL’s concussion program. Bradley spoke carefully about the issue Monday, but said the concussion may have caused the unusual block. “I know after the game he had concussion symptoms,” he said “That’s where I’ll leave it at that, the play itself if you watched it.” Asked if Pierce had the symptoms before the play, Bradley said, “I don’t know. I imagine so.… Yeah I’m sure. I mean he’s in the concussion protocol. It’s just unfortunate that he had those symptoms and that play happened.”

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