What does the imam do when asked to shorten or lengthen the prayer?

The questioner : If there is an elderly man with shortness of breath praying behind the imam. When the imam prostrates and lengthens the prostration, the man is affected by his shortness of breath and asks him to shorten it, citing the fact that the Prophet (peace and blessings be upon him) said, "Whoever is the imam of the people, let him shorten the prayer." And when he shortens it, the elderly man who is unable to keep up with the speed of the worshippers asks him to lengthen it, especially in prostration, saying that lengthening does not harm you and that the weak one is the leader of the caravan. So what should this imam do in this situation?

The Shaykh : There remains a third category, which is the middle path: make the prayer moderate. So let him make the prayer moderate. People today are inclined toward shortening and hastening, but the Prophet (peace and blessings be upon him) used to order the people to shorten the prayer.
So that their prayer would be like the prayer of the Prophet (peace and blessings be upon him and his family). He used to lead them in prayer with Surah al-Saffat and a thousand verses, but he did not prostrate in it. Rather, he prayed the Maghrib prayer one day with Surah al-A'raf. So shortening is not based on the desires of the people; it is based on conforming to the Sunnah. Whatever conforms to the Sunnah is the shortening. Then it is said to the one who is distressed when the imam lengthens the prostration somewhat: The prayer is not obligatory. You are now praying a voluntary prayer, and you may leave the voluntary prayer. The imam should be moderate between these groups. Yes.