I apologize in advance for the humongous source I am about to link but I feel
like it's important to understand the context here to get a clear picture.
Nonetheless I'll try to filter out the important bits to keep it as short and
simple as just possible (if somebody feels adventurous I'd appreciate a quick
skim; if there's anything you can't read, let me know).

<https://i.stack.imgur.com/0oahq.jpg>  
<https://i.stack.imgur.com/NO6wd.jpg>  
<https://i.stack.imgur.com/fptTL.jpg>  
<https://i.stack.imgur.com/GEsKj.jpg>  
<https://i.stack.imgur.com/otOHF.jpg>  
<https://i.stack.imgur.com/51Jdh.jpg>

As per the title, I'm confused on the ambiguity on the given phrase. To give
the scene, our main character 歩{あゆむ} is facing off against the vampire ninja
セラ who has the power to manipulate leaves and turn them into sharp blades
(swords, shuriken, etc.). At the beginning of the battle it
says「セラが両手を広げると、どこからか緑色の葉っぱが落ちてきた。」She then charges at Ayumu at which point he
remembers her favorite phrase「燕返し」which is exactly what happens: Two
consecutive diagonal strikes, executed twice.

At this point I'm imagining her holding a single sword with both hands as that
is how I've seen an actual 燕返し executed. Not sure if there's a 二刀流-variant and
how that'd exactly work but maybe my imagination is lacking.

The next important bit is once Sera got knocked down by Ayumu once, she gets
up again and charges at him. Now Ayumu is ascertaining her holding a weapon
and describes
it:「彼女の両手には、刃物のようなものがある。剣――――と言っていいのか。それは葉っぱだった。細長く伸びた一枚の巨大な葉っぱ。極端に細長くなった葉っぱは、剣に似ていなくもない。」

Then there's a part where she attacks him from above executing her
special「秘剣、燕返し。――八連」attacking from eight sides at once using other blade-
turned leaves around him in addition to her sword. After Ayumu gets torn into
pieces (he's a zombie so he's still alive here) he looks at her and
thinks「目の前に降り立った黒マントの天使は、その赤い瞳を俺に向ける。両手に持った緑色の剣と、長い髪。どっかで似たようなものを見たな。確かあれは、両手に長細いものと、長い髪。俺が覚えている、『俺を殺した奴』」(his
killer is described pages before as「両手に長細いものを持った、長い髪の人間」)

His thoughts then go on:「二刀流で切り刻むなんてよほどの達人でも難しいぞ。」This is where I got
confused. So was Sera wielding two swords all along? After some more fighting
we get more exposition from
Ayumu:「翼に使った葉が全部だったのか、あれだけ辺りを飛んでいた葉っぱがなくなっている。両手にある二枚のみだ。」This should be a
clear indicator that she was using two swords all along, no?

After the fight is over:「セラはなぜか剣から手を離した。 **それ** は小さな葉へと戻り、ハラリと地に落ちる。」Shouldn't
it be それら here since it's two leaves? Or can それ be used as a plural as well?
So now I'm still confused on whether she was using two swords or just one.

Again huge apologies for the mess of a post and the huge source but I'm not
sure how else to get my point across. ;) Obviously easier to follow my
question if you could quickly read through the six pages but I don't expect
you to. In any case, input is as always much appreciated!
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question
grammar
両手に持った剣 - One sword in each hand or one sword held with both hands?
The word 両手【りょうて】 specifically refers to "both hands" as a single unit. This
makes it more likely, in my non-native-speaker understanding, that this is a
single sword held in "both hands".

Later in the text, we get further confirmation that this is one sword held in
"both hands", when we get a description of what Sera is holding (emphasis
mine):

> それは葉っぱだった。細長く伸びた **[一]{●}[枚]{●}** の巨大な葉っぱ。

If she's holding **[一]{●}[枚]{●}** の...葉っぱ in 両手【りょうて】, we can be pretty sure
that the author does not intend for this to be two swords, each held in one
hand.
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I'm a native speaker and was also confused at the 二刀流 part. (I have no prior
knowledge about this work.)

  * **秘剣・燕返し** (p. 83): Okay, 燕返し usually refers to something like [this](http://fukuitravel.com/%E5%89%A3%E6%8A%80%E7%87%95%E8%BF%94%E3%81%97%E8%AA%95%E7%94%9F%E3%81%AE%E5%9C%B0-%E3%80%8C%E4%B8%80%E4%B9%97%E6%BB%9D%E3%80%8D/)
  * **両手には刃物のようなもの (snip) 一枚の巨大な葉っぱ** (p. 84): So she's holding one huge leaf as a two-handed sword
  * **セラは剣を持った両手を広げる** (p. 86): Huh? How can she do this while holding a big sword?
  * **二刀流で切り刻む** (p. 87): Why 二刀流? But he seems to be referring to someone else here...
  * **両手にある二枚** (p. 88): Oh, so she is clearly holding two swords at this point. Did I miss something? Did she switch to duel wielding at some point?

Then I read everything again and concluded she was probably holding two blades
from the beginning. ( **EDIT** : Or maybe she switched the two styles silently
because there are many floating leaves to serve as swords, shields, ranged
weapons or wings.)

The Japanese language does not distinguish between singular and plural forms.
両手に持った剣 in isolation is ambiguous, and it can refer to one two-handed sword or
two swords. それ can refer to plural objects, too. Still, in this case, I think
the author's writing style is unclear, and 一枚の巨大な葉っぱ is particularly
misleading; maybe the author somehow failed to add それぞれ(の腕) here?
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It is very confusing.

I’m guessing from the following part that she grabbed one of the leaves that
fell off her wings during the last series of attacks and she was still holding
one when it was over.

> 彼女の持つ剣だけじゃない。俺の周りにある葉も剣になっているからできる攻撃だ。

I don’t know how she spread out her arms when she was still holding one big
sword with her both hands, though.
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answer