The Emperor and His Brother

A young boy betrays his family who hides a refugee and tells the pursuer where the hiding-place is – just because he wants a valuable telescope for reward. His father decides to kill the boy in order to restore the honor of the family. It's Ti Lung versus Lo Lieh in the period piece action movie The Emperor And His Brother that features some marvelous sets and rudimentary special effects that delightfully gives Ti Lung's character's secret "peacock fist" technique a fantastical dimension.
(Sources: Letterboxd, IMDb)