The extension has a particular purpose
Law 7 extends a half when a penalty must be taken or retaken until that penalty is completed. Reaching the displayed end of the half does not remove the awarded attempt.
Imagine the referee awarding a penalty in the last live passage. The clock shows no apparent time remaining while the taker prepares. The preparation and kick can still belong to that half because the attempt must be completed.
Distinguish the extension from another open-ended passage
An ordinary penalty during ongoing play and a penalty being completed in an extended half have different surrounding circumstances. Do not assume that every possible follow-up phase remains available simply because the first kick was allowed. Law 14 supplies the detailed completion procedure.
For a viewing note, mark why play is continuing: ordinary remaining time, a pending penalty or a required retake. This helps explain why the referee can allow one more attempt after a procedural infringement without announcing an arbitrary new block of added time. The example addresses the half’s extension, rather than promising an exact television ending or resolving all rebound situations.
Questions answered
Can the displayed end time remove a penalty already needing to be taken?
No. The half is extended for its completion.
Is this permission for unlimited further open play?
No. The extension has the stated penalty-completion purpose.
Sources & further reading
Official references for the subjects discussed. Service terms and device software can change.