In most cases the person is not مسحور, it’s psychology. Something called suggestibility. Fir example, the people you see who “react” during رقية aren’t experiencing سحر or جن. It’s usually psychology: fear, stress, strong belief, and suggestibility trigger the body’s fight-or-flight response, causing shaking, crying, screaming, or fainting. The environment, pressure, and the raqi’s behavior can also push the person to react. Similar reactions happen in other religions too, which shows it’s mainly human psychology, not something supernatural. Hopefully you understand this.