[quote=@Guardian Angel Haruki]
[@rush99999] Oh shoot! A fight already?! :lol
[/quote]

Yup. :lol

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[quote=@Guardian Angel Haruki]
Just to double check the scenario: Is the scabbard done at the time of the attack? And if so, how long does it take to attune to a magic item?
[/quote]

The scabbard bracer is done at the time of the attack. And attunement requires a short rest to achieve.