Why use 一本 in the expression 一本取る


I was watching [an episode](https://www.youtube.com/watch?v=L3T9Q4n1UKs) of
ファニエスト外語学院 on judo.

At 6:26, the judoka remarked how his opponent ボビー could win him just by his
horrid face, saying `「顔で一本取られた」って感じです`.

**I am interested in understanding why the 助数詞`本` was used in the expression,
especially when it is used for small, long things.** I looked up `一本取る` in
ディジタル大辞泉 , which gives the definition `柔道・剣道などで、完全に技が一つ決まること。` So I believe
`一本` here houses the meaning 'in one go/shot/try', though I am not completely
sure.

