Several years ago this rule was added to prevent an occurance that happened during a championship game in Louisiana.....
(1) K led by 2 points and was kicking off with 0:05 left in game;
(2) R, after several backward passes, threw a forward one at K's 20;
(3) R2 caught the IFP and entered K's EZ;
(4) Clock read 0:00, K needed to take penalty to cancel TD;
(5) R got an untimed down from K's 25;
(6) Hans-an exchange student from Europe- kicked the game-winning FG.

We then discussed..I pointed out the possibility of it occurring on a 4th down play. There wasn't much concern and I didn't argue as I had bigger Lobsters to boil (some non-Mainers may say 'fish to fry') in passing 7-11c : It isn't DPI if contact by Bis obviously away from the direction of the pass.
Since it's passage IG on 4th down by leading team has occurred in a high profile NCAA and state championship NFHS game with the officials "rightly got it wrong" by giving A an untimed down. I'll propose my suggestion to right the wrong caused by those officials