I saw some of his students doing these forms on a tape of Wing Lam's 25th anniversary (I think). It's been a while since I saw the tapes, but I remember that I recognized the forms immediately as BSL forms, but with a different flavor. I have seen a student of Lai Hung, who was himself a student of Long Zi Xiang, perform #6 and I remember the flavor being similar. If I get a chance to see the tape again, I'll try to say something more about it...