The first part of an attack animation is called the lead-in. While these might look like nothing more than the simple drawing back of a weapon, there's a lot of thought and craftsmanship that goes into them.
攻撃モーションなどの一番最初、「かまえ」。
ただふりかぶるだけのようでいて、いろんな気遣いや工夫があります。