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Is it a contraction of the 「～なければいけない」 form?

If so, why is it used with 「こ」 here, shouldn't it simply be 「剣を **取らなきゃ** ！」?

[![enter image description
here](https://i.stack.imgur.com/06OSj.png)](https://i.stack.imgur.com/06OSj.png)
CC BY-SA 4.0
2022-11-13T05:25:23.330
97179
2022-11-13T10:06:31.593
54716
question
grammar
What does this 「こなきゃ」 (bottom-right panel) mean here?
くる goes to こない, so 取ってくる goes to 取ってこない. Hopefully it should already be clear
how こなければならない contracts to こなきゃ.
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2022-11-13T06:05:46.047
97180
2022-11-13T06:05:46.047
816
97179
answer
This is a shorten expression. 取ってこなければいけない！ → 取ってこなければ！ → 取ってこなきゃ！
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2022-11-13T10:06:31.593
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2022-11-13T10:06:31.593
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answer