Combining prayers due to rain, and the rain stops during the second prayer: Is it invalid?

Question : Suppose the combining was due to rain, and the rain continued until they prayed two rak'ahs of 'Isha', then it stopped, and there was no mud because the markets are paved with asphalt, so there is no mud. Does the combining become invalid in this case or not?

Answer : We say that the combining does not become invalid. Why? Because it is not a condition that the excuse continues until the completion of the second prayer; it is not required.