Because it was called regeneration. It was one of the three things highlighted by Queen as to what it entails. And a night rest? Reiju healed from a candy jacket bullet designed to bypass their powers within a couple minutes. It is mid battle healing, that’s why they’re so hard to handle.
The doctor after treating her said she was healing quickly and would be fine after a night of rest, and considered THAT to be extremely impressive. Not that she had already perfectly healed by the time he examined her. Which was a WHILE after she first got shot.







