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My question is on how to properly interpret utterances like the below.

> あれに正面から挑むのは中々に手間よ。どうするの？
>
> 下手な小細工が通じる相手じゃないからなあ。正面から挑むだけだよ

Occasionally I'll see someone end the sentence with からな・からね where the sentence
could have continued on and still had made sense without the 。.

Should these utterances be treated like 「下手な小細工が通じる相手じゃないから正面から挑むだけだよ」 in
terms of meaning but with the interjection particle there to serve its
function, Should it be treated as two separate utterances with implied stuff
after the から, or something else?

edit:additional examples

(rumour of the protagonists duel has spread throughout the school and his
friends are talking about it.

```

    「あいかわらず、噂の拡散スピードが尋常じゃないわね。デイルが口に出したの、ついさっきの授業なのに」
    
    「まあ、ある意味で閉鎖された世界のうえに、みんな娯楽に飢えてるからな。こういった噂はいち早く広まるさ」
    
    「それにまあ、デイルは人気あるからな。あのデイルが人族と勝負、となれば誰もが興味深々だろう
    
```

edit 2: After l'électeur's post I went and opened up some studies done on the
usage of から and came across
[原因・理由表現とは](http://hougen.sakura.ne.jp/shuppan/2007/1-1.pdf) which describes
the usage of 「から」と「ので」 with 5 usages.

```

    (1)事態の原因-主節が具体的な事実・事態を表し、従属節が主節の事態そのものを引き起こす原因・理
    由を表す場合であ
    
    (2)行為の理由-主節に話者の意志的な行為や聞き手に対する働きかけが現れ、その行為を行う理由が「か
     ら」「ので」によってされる。
    
    (3)判断の根拠-This one is too long but this isn't the usage anyway
    
    (4)発言・態度の根拠-主節に、聞き手に対する働きかけや話し手の意志などの発言や態度が現れ、そのような
     発言・態度の根拠を表す場合がある。
    
    (5)理由を表さない用法-原因・理由文の中には、原因・理由を表しているとはいい難いものがある
    
```

and lastly we have the usage of it as a sentence ending particle(which in this
case fits with the location)

Could anyone explain which usage this then and how it is used?

Based on my understanding of these it isn't 1 or 3. 4 and 2 I'm not really
sure about but they don't seem to fit which then means it would be the usage
of it as a sentence ending particle(which I haven't been able to find any real
documents about that explain its usage apart from implying something else
after the utterance).
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meaning
usage of から at the end of the first sentence with the second part in the next
> 「あれに[正面]{しょうめん}から[挑]{いど}むのは[中々]{なかなか}に[手間]{てま}よ。どうするの？」
>
> 「[下手]{へた}な[小細工]{こざいく}が[通]{つう}じる[相手]{あいて}じゃないからなあ。正面から挑むだけだよ。」

My own translation (just in case):

> Person A: "It'll be pretty troublesome challenging that guy head-on. What ya
> gonna do?"
>
> Person B: "He's not the kind to fall for cheap tricks, for sure. Guess I'll
> just challenge him head-on."

**_My answer_** to your question would be that the two sentences in Person B's
line (in the original, of course) would look better if they were left as are
in two separate sentences.

Why? Because for the sentence structure 「Mini-sentence #1 + から + Mini-sentence
#2。」 to sound natural, the content of Mini-sentence #2 would need to represent
the logical and specific (or concrete) result or effect of the content of
Mini-sentence #1.

In your example, the idea of 「正面から挑む」 was originally mentioned by Person A,
not Person B, to begin with. In addition, 「正面から挑む」 as a strategy is not a very
specific one. It is almost like saying "Let's go for broke!"

What would happen if you combined the two sentences into one using から in the
middle? Quite frankly, I do not think most native speakers would notice
anything strange. I noticed it because this is a place for questions and
answers and I read your question carefully a few times. Had I read the
combined-into-one sentence in a story, I probably would not have felt anything
really unusual about it. It is 100% informal spoken language, so people would
just read on without thinking anything.
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Holy Cow, You are soooooooooooo good at Japanese!.

Anyway, I was interested in this discussion so that let me join in as a
"complement" lol.

I would like to apologize first off if my "answer" MAY be difficult since your
question level is quite high.

Now, let me go onto your first question.

> > Should these utterances be treated like 「下手な小細工が通じる相手じゃないから正面から挑むだけだよ」 in
> terms of meaning but with the interjection particle there to serve its
> function, Should it be treated as two separate utterances with implied stuff
> after the から, or something else?

I am afraid, your English is a bit difficult( I would appreciate if you
"clarify" or rather, please do not ask in a long sentence, but cut some part
one by one, so that I can comprehend precisely (s)).

After having read your sentence, I personally assumed you know very well the
definition of this particle な. な is the particle denoting the "utterance" by
the person who said it him/her self. And after checking and surfing through
the multiple sites, なあ is a variable version of な, ( and especially spoken in
the "West Japan"??????? I DO use, however ) but defined same with な, but "to
me, personally", なあ sounds more frank than な. Though even な itself stands as a
frank word to me.

And

> > Should it be treated as two separate utterances with implied stuff after
> the から, or something else?

**No.** We go here to your last question.

> > edit 2: After l'électeur's post I went and opened up some studies done on
> the usage of から and came across 原因・理由表現とは which describes the usage of
> 「から」と「ので」 with 5 usages
>>

>> (1)事態の原因-主節が具体的な事実・事態を表し、従属節が主節の事態そのものを引き起こす原因・理 由を表す場合であ

……… ( I would like to copy and end your post here since it it long. )

So, as you had checked out, から denotes the beforementioned reasons.... so on.

Thus, I said NO. Because the conjunctive particle から, as you mentioned, is
functioning as the conjunctive, thus, it is treated as one sentence with
conjunctive から asserted "between".

Oh, I found out it is not so complex. Wow ( just my exclamation, s))
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