Cases in which the ma'mum says the closing salam before the imam

Question:
Are there cases in which it is permissible for the ma'mum to say the closing salam before the imam?

Answer:
If he intends to pray alone, or if a situation arises that requires him not to continue with the imam, he intends to pray alone, completes his prayer for himself, and says the closing salam for himself. This is what the man who prayed behind Mu'adh (may Allah be pleased with him) did when Mu'adh recited Surat al-Baqarah in the 'Isha' prayer. This man had camels that were giving birth, so he left them and turned to the prayer. When he saw that the prayer would be long and that his camels might be lost or go astray, he intended to pray alone and completed his prayer. He said the salam and then went to his camels. This was reported to the Messenger of Allah (peace and blessings be upon him), and he did not rebuke him. Therefore, it is permissible in such a case, or if he is struck by an illness and cannot continue, for him to pray alone and complete his prayer on his own. Yes.