You are the project manager on a large hybrid program with several agile teams. One of your junior Scrum Masters approaches you privately, frustrated that their team's daily standups routinely run 40 minutes, drift into problem-solving, and leave developers disengaged. The Scrum Master says they have tried repeatedly to cut people off but it feels awkward and the team ignores them. They ask you to attend the standup and 'take over' facilitation to fix it. What is the BEST way to support this person's development as a servant leader?