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Battle takes place in an open field at night

Round 1: Ainz has standard equipment
Round 2: Ainz has the same equipment during his fight against Shalltear

Ichigo...

Ainz Ooal Gown

Ichigo is infinitely faster, and can beat out Ainz in terms of energy attacks as well.

Depending on how literally you take the text, Shalltear could be FTL though.