head / chief / first (occasion, thing etc) / classifier for poems, songs etc
In the outhouse, the chief lends his piece pipe to Sherlock Holmes. Sherlock smokes some weed in the pipe and looks at himself in a hand mirror, thinking that he's uber cool and that he'd pass as a quite formidable chief himself.
to guard / to defend / to keep watch / to abide by the law / to observe (rules or ritual) / nearby / adjoining
Sherlock Holmes just graduated from police school and stands guard in the outhouse. Still wearing his graduation cap and carrying a huge shield, he's protecting the outhouse's art. The visitors are a bit afraid of him, so he thumbs up to show them that there's no danger from him.