post from Yarek's site:

Here's a new twist to the mystery of the early demise of YCF, as 'revealed' by an eye-witness, a former student of the martial arts school headed by YCF: http://www.zjonline.com.cn/gb/node2/...ai1031866.html

According to the student, YCF, a late riser, was annoyed with the noises caused by a class conducted by a well known Southern style instructor. He discredited the external style and challenged the instructor to punch him 3 times. YCF grimaced after the 1st punch, blood seems to appear in his mouth in the 2nd punch. He clinched to his stomach for the 3rd punch and immediately did a palm strike with his left hand to the chest of the instructor. The instructor was thrown 2 meters away spilling blood.

The instructor died 2 years later and YCF 5. Apparently both of them never fully recovered from the injuries.