Sau hai leong moon seen ... (The hands are like the two swinging parts of a door)

[YunXiang]

Sau hai leong moon seen, chun pang kheok ta yien
The hands are like the two swinging parts of a door, it is the legs that strike opponents
手喺兩門扇,全憑腳打人
Cantonese: sau hai leong moon seen, chun pang kheok ta yien
Cantonese (Yale): sau2 si6 leung5 mun4 sin3, chyun4 pang4 geuk3 da1 yan4

For those who cannot see Chinese characters in their web browser, please see the attached picture below.

[Note: This phrase is in colloquial Cantonese form. Thus, only the Traditional Characters and Cantonese pronunciation are provided.]

[YunXiang]

This term can be found on Grandmaster Wong's Q&A - April 2009 (part 3) webpage under Q&A no. 8:

http://shaolin.org/answers/ans09a/apr09-3.html