Reference: The kickoff that just touched the chalk.
I know that once a KO crosses the goal line it is a dead ball and does not have to be returned. But the returner voluntarily grabbed the ball and chose to return it. I don't understand why it was ruled a TB. If he had returned it for a TD, could TBay challenge and get it ruled a TB?
How is this situation different from any other instance where a returner basic a bad decision and returns the ball out of end zone.