After the debacle a couple of years ago when Central Michigan was given an erroneous free play at the end of the game, I've been thinking about situations where A/K puts the ball in play, time expires during the down, and some penalty situation occurs where the period is extended by an untimed down, but B/R is the team that would put the ball in play during the untimed down.
Previously, the only situation I could think of is if there is a legal change of possession on the play and then A/K fouls during the post possession change running play.
However, with the new kicking penalty enforcement rules, I think there's a new option. Any foul by K during a free/scrimmage kick down can be "tacked on", so even an illegal formation foul by K on a punt as time expires could allow B to run an untimed down (previously this would be previous spot enforcement, and K replays the down).
Am I correct in this? Are there other situations where this might happen?