Question

A period shall not be extended by an untimed down if, during a down in which time expires, a foul occurs for which enforcement, by rule, results in a safety.

Answer 1

If you are asking, if this is a true or false statement then the answer will be true. The period will never be extended by an untimed down if, in which time expires during a down, a foul may occur enforcement by rule and it will results in safety.