Which of the following scenarios does NOT require a judge's intervention?

The scenario where players are playing at a reasonable pace is the one that does not require a judge's intervention. In Magic: The Gathering, the pace of play is an important aspect of maintaining a good tournament environment, but if players are naturally playing within an acceptable time frame, there is no need for a judge to step in.

The other scenarios involve situations that typically necessitate a judge’s assistance. When a player requests clarification on a rule, it indicates a misunderstanding that a judge can help resolve to ensure fair play and correct application of the game rules. If a player exhibits unsporting conduct, this is a serious issue that needs a judge's attention to uphold the integrity of the game and address any potential penalties. Lastly, if a player is unsure of their life total, that can lead to disputes or confusion during gameplay, and a judge would need to intervene to clarify and document the correct life totals to maintain order in the match. This distinction between scenarios that require a judge's involvement and those that do not is crucial in understanding tournament regulations and maintaining a productive environment.