Do we need an untimed down?

[Ed Maeder]

Have a question on a situation we had tonight. After a play we had a double personal foul dead ball. There was 24 seconds left in the game both players were ejected. The clock was started on the ready for play and it ran out without a play being run. In the NFHS book in Rule 3-3 Art3 it states that a period must be extended with an untimed down if during the last timed down of the period a penalty is accepted. Are these penalties considered to be during a timed down and did we need to run a play or not?