User blog comment:Xilinoc/Top 10 Characters of the Blood War Arc/@comment-24769684-20161029022136/@comment-5398287-20161101005616

I'm sure Kubo's original plan for Uryu was to have him weaken Yhwach with Antithesis, but not enough to render him vulnerable - so he fires the arrow and Yhwach's too weak to dodge, thus setting him up for Ichigo's final attack.

But instead we got an RKO out of nowhere.

Thanks Shonen Jump.