When Yip Goo Sing first appears in the second of the LUK SIU FUNG novels (THE EMBROIDERY BANDIT), there's little indication of his sinister intents and fate. He was a heroic and noble swordsman - almost like a slightly upgraded version of Sai Mun Chui Sheut. When Yip finally showed his true colors at the end of THE DUEL, it was likely a shock for many readers.
Were there any hints or clues that something wasn't quite right about Yip Goo Sing, however? At what point did you figure that he was not quite what he seemed?