Understanding 「100人以上が心臓麻痺なんて偶然があるか？」


From the second episode of _Death Note_ :

> 100人以上 **が** 心臓麻痺 **なんて** 偶然 **が** あるか？

  1. Is this sentence parsed as one sentence (as above), or two:

> 100人以上が心臓麻痺なんて[だ]。
>
> 偶然があるか？

  2. If it's one sentence, it seems there's a double が. How to make sense of this?

    * It doesn't seem like there's [left-node or right-node branching](https://japanese.stackexchange.com/a/17744/51280) happening?
    * Is (100人以上が) acting as the subject of the sentence, while (心臓麻痺なんて偶然があるか) is acting as a subordinate clause that is somehow acting as the whole sentence's predicate?
  3. I know that particles are colloquially dropped all the time in Japanese, but the floating 心臓麻痺 **なんて** is a bit confusing. I assume here this stands for 心臓麻痺など (or perhaps [心臓麻痺などとて](https://en.wiktionary.org/wiki/%E3%81%AA%E3%82%93%E3%81%A6#Etymology_1)?). Is the whole phrase functioning adverbially (so doesn't need a particle)? Or is there an implicit だ/な (copula) or は (topic market) being omitted after なんて?

**EDIT:** After writing this all out, I realize an alternative way to parse
the sentence is as

> 100人以上が心臓麻痺なんて **な** 偶然があるか？

with the な being colloquially dropped, and (100人以上が心臓麻痺なんて **な** ) modifying
偶然. Is this the correct way to parse it?




This is one sentence. 100人以上が心臓麻痺なんて modifies 偶然, and なんて here can be replaced
with などという.

P.S. Interestingly, なんてな is an existing expression and also makes sense here,
but it's not なんて + な (aux verb, particle or na-adjective ending) but is
possibly contraction of などというような. cf.
<https://dictionary.goo.ne.jp/word/%E3%81%A6%E3%81%AA/>

