At the end of ROCH, Yeung Gor taught young Cheung Gwun Bo (the future Cheung 3 Fung) four strokes that the youth used to critically injure the Mongolian mercenary warriors Siu Seung Tze and Wan Hak Sai. Just what were these four strokes? They obviously weren't part of Sad Palms (because that would require Cheung Gwun Bo to have a kind of sadness that he didn't have). Were they a part of Yeung Gor's regular martial arts, or were they something that Yeung Gor made up on the spot for Cheung Gwun Bo to use? Moreover, this was Cheung Gwun Bo's first formal training in the martial arts. Did those four strokes influence his later martial arts development in any way?