Zaku could use both his arms during their fight and he lost to Shino when he was just a kid ._.
They are both kids in this scenario too. One of Zaku's arms was broken by Sasuke so he couldnt use his wind jet in that arm. When he tried to use it anyway, it backfired and his arm was blown off.
IIRC...
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Do some checking next time.
I like how you edited out the part of my post where I acknowledged my mistake and changed the thread conditions.