wow, where are you getting this?
By definition, a free kick is either a safety kick or a regular kickoff.
Once again, if the punt returner fair catches a ball with no time left, the return team can elect to try a fair catch kick down. The placekicker may not use a tee, and the Defense can not rush the kick. So, in other words the kicker attempts a FG with the defense lined up 10 yards away. This means that you would have a kick return team and a kickoff team on coverage for this in case the fair catch kick down falls short. If you don't believe my explanation, click this link from the NY Times about it.
EDIT: the article I cited by the NYT uses the free kick term interchangeably with fair catch kick down. Thus the reason for confusion. If the media can't get their crap straight, how will the fans that rely upon it.