[Soul Society]
Hazuki Tsubame's holding cell

"Perfect", the girl replies mechanically. "As I understood it, your research on 'purification arrows' is centered around a curious case of a Quincy attaining powers of a Shinigami." The girl blinks once. "According to past data, this mix should not be possible. But, based on your notes, my master has hypothesized this phenomenom to be a natural extension of a Quincy's ability to absorb external power and turn it into their own. If that is the case, the process of granting Quincies their 'purifying arrows' could be greatly accelerated if they were turned into substitutes en masse. Does this assessment seem credible to you?"