What is the operative cause of breaking the fast in the hadith: “The one who performs cupping and the one who is cupped have broken their fast”?

The Shaykh : Cupping in the past was, as we mentioned, done by the method of sucking. Personally, when I was at the beginning of my path in knowledge, and I think I have many examples from myself, whenever I heard the hadith: What is the reason? I used to think that cupping back then, or cupping in general, was like it is today. After a while, I learned and increased in knowledge, and I came to know that the cupper used to cup by sucking the blood. So at that time, the one who sucks the blood might have it enter his stomach, thus exposing himself to breaking the fast. As for the one who is cupped, it is because he is the cause of the cupper breaking his fast. So his statement (peace be upon him): is first of all understood in the context of that type of cupping where blood is extracted using a long horn, so when sucking, the blood might reach the mouth of the cupper.
And secondly: The scholars and jurists have two schools of thought regarding this hadith:
The first school of thought is that it is a clear, decisive verse that has not been abrogated, and that every cupper and every person who is cupped who are fasting have broken their fast, .
And the other school of thought, which is the view of the majority of scholars, is that it is not ... breaking the fast; rather, it is a dispensation, because it is established from the hadith of Abu Sa'id al-Khudri and others that the Prophet (peace and blessings be upon him) granted a dispensation for cupping for the fasting person. So according to this, there is nothing wrong with cupping for the fasting person, even if the method is that primitive method. Rather, the cupper must be cautious and take care so that nothing of the blood enters his stomach. If it does enter, he has broken his fast.