Bai Xiaosheng used hypnosis on Hao.
From the moment Hao arrived, Bai Xiaosheng's every action, including snapping his fingers and his suggestive speech, was all part of the hypnosis.
Actually, hypnosis isn't as mystical as it seems. For some people with strong wills, it can be quite difficult to employ.
Hao was different. When he rushed over, his face was clearly overly joyous, believing himself to be safe and his guard at its lowest.
Even so, Bai Xiaosheng didn't just use his voice and language to induce hypnosis; he had many other techniques at his disposal. When he locked eyes with Hao, even the frequency and number of his blinks were a strong suggestion.
These were things ordinary hypnotists couldn't possibly achieve; Bai Xiaosheng could only reach this level with the help of Red Lotus.