We all know how the famous poem from LUK SIU FUNG: THE DUEL goes...
On the night of the full moon,
Atop the roof of the Forbidden City,
One Sword From the West,
The Flying Angel Beyond Heaven.
"The Flying Angel Beyond Heaven" was, of course, the name of Yip Goo Sing's sword technique. Does "One Sword From the West" refer to Sai Mun Chui Sheut's sword technique? In the first two LUK SIU FUNG books, Sai Mun Chui Sheut's sword technique was never called by a proper name. It was simply refer to as "lethal sword technique." "One Sword from the West" does hint at Sai Mun Chui Sheut's surname ("Sai Mun" = "Western Gate").