This could be thought of a a tiger technique. The technique can be a block/break combination or used as a double pulling grab.
As far as the noise “wah” could be used. Lee Koon Hung never said to say anything. As far as noises go some techniques have set noises others you can use a noise if you want. Developing your own feel is important.
The chinese name is sheung pak
Sheung fong toi
Pow Jahng (lifting elbow) Big Jahng (squeeze elbow)