What is the purpose of putting 「のは」 at the end of a sentence?


The dialogues below are said by an old man to stop a fight between young guys
in two separate speech balloons. The first one is a screaming-type speech
balloon which he shouted at them and the later one is a normal speech balloon
which he said in a milder tone.

> First balloon: おっと よしな よしな くだらねえなぐりあいなんぞやる **のは！**
>
> Second balloon: どうせ やるんなら堂々と正式の拳闘でケリをつけたらどうなんだい

According to my understanding, the particle 「のは」 used for nominalizing the
preceding verb and making it to be a topic marker. I would like to know why it
has to be put at the end of the sentence.




Basically the sentence has been reversed.

> よしな くだらねえなぐりあいなんぞやるのは！

is the same as

> くだらねえなぐりあいなんぞやるのは よしな！  
>  Stop it with all that stupid fist-fighting!

This な, by the way, is different from the one in よすな (don't stop!). It's an
order to do something, rather than not to do something. It's most likely from
なさい.




Basically the sentence has been reversed.

> よしな くだらねえなぐりあいなんぞやるのは！

is the same as

> くだらねえなぐりあいなんぞやるのは よしな！  
>  Stop it with all that stupid fist-fighting!

This な, by the way, is different from the one in よすな (don't stop!). It's an
order to do something, rather than not to do something. It's most likely from
なさい.

