User blog comment:Martialmaniac/Maha and Netero/@comment-32818639-20180404025554/@comment-32818639-20180411204210

I found it being used once in Chapter 48 as ", Gehō [or Gehou]—lit. 'Outside/External Method'". More precisely, in the first text balloon of the fourth panel of this page. In the original text this is not highlighted graphically in any special way and in the Viz translation it does not even seem to have been mentioned (is only implied in the chapter's general context). It's also a fairly neutral term, an "External Method" could be used in a "harmful" way or in a "gentler" way. But maybe I'm not considering some detail or something else.