Perhaps it was because his foundation was insufficient!
Usually, after three rounds of refining essence into energy, one begins to absorb "foreign qi" from the outside world, storing it in the ancestral aperture between the eyebrows.
"It is said that in High Willow City, the second-generation ancestors of the six major families in the inner city all underwent nine rounds of refining essence into energy,"
"Using their own most pure nine streams of true energy, to guard the ancestral aperture between the eyebrows, stabilizing the 'self' and consciousness."
"Therefore, even though they are all over a hundred years old and approaching the twilight of their years, none have lost control or been influenced by the nature of foreign qi to the point of falling into madness."