I've been trying to do the dp+B to drink cancel myself, and I can't seem to do it either. Sorry, I must have been wrong, I thought I had done it a while ago. I guess not. I wonder if Hwa might be in an aerial state on the very first frame. You might only be able to do aerial specials. The easy way to test would be to see if you can cancel from dp+B into qcfx2+B/D, since that would require only a f+B/D after the initial dp+B input. But yeah, it's not really worth doing.