User blog comment:Blacktitan1031/could have capture the female titan sooner?/@comment-23822532-20130927184535

Annie felt rather down when Rivaille... fucked her up, so he could have killed her right away, though he didn't for many reasons:

1 - Was scared of killing Eren in the process, since Titan's "corpses" leave nothing behind.

2 - He had no way of knowing if Annie could pull another transformation, or regenerate fast and kill either him or Mikasa.

3 - He was so damn angry. He's never seen fighting in such a wild way, he was always precise, fast, flawless, but then he saved Mikasa and forgot to take care of himself, which wouldn't have happened if he was calm as always.

4 - And then he got hurt.