The ruling on prostrating on the back of another praying person during crowding

Question : The questioner asks: Is it permissible for a Muslim to prostrate on the head of the person in the row in front of him during the crowding?

Answer : This issue has three opinions among the scholars regarding the state of crowding where one cannot prostrate. Some scholars said that you prostrate on the back of your brother if it is crowded. Some scholars said that you gesture with your head. Others said that you wait until the person raises his head from prostration, then you prostrate. These are three opinions. Which one is the correct one? The well-known position in the Hanbali school is that one prostrates on the back or leg of his brother. But which of these three opinions is the stronger?
If we say that he prostrates on the back, there is a problem. What is it? He interferes with another person and disturbs him. Also, the prostration is not actually complete; it is not perfect. Why? Because if you prostrate on him, you are not in the posture of one prostrating, because his back is raised, so you are not exactly in the posture of one prostrating. If we say that he gestures, the gesture has a basis in the Shari'ah. What is it? That the one who is unable to prostrate gestures. And in reality, this person is unable to prostrate, because prostration is only on the ground, and here it is not possible. If we say that he waits, he has a point of view, because he lagged behind the imam for an excuse, so he is like the sleeper. Some people nowadays sleep and pray; when the imam prostrates the first prostration, he remains, then the imam stands and sits between the two prostrations and prostrates the second one while the person is still sleeping. What does he do when he wakes up? He stands up from prostration, sits between the two prostrations, prostrates the second one, and catches up with the imam. Why? Because he lagged behind for an excuse.