Which master's calligraphy is more elegant, free as water and hot as fire?

If the momentum is wild, it must be Huai Su.

Huai Su, born in Lingling, Yongzhou (now Lingling, Hunan), was a calligrapher in the Tang Dynasty. He is famous for "Weeds" and is known as the "sage in the grass" in history. Being a monk since childhood, I like calligraphy after meditation. And Zhang Xu, collectively referred to as "Dian Zhang Kuang vulgar".

Huai Su's cursive script is thin and vigorous, flying naturally, like a whirlwind of showers. Although his calligraphy is capricious and ever-changing, it has statutes.