For 10k-ers: Edit the post to be a proper, well-formatted answer, then flag for a mod to undelete.
For the sub-10k, there are two natural routes: either persuade a 10k user to help (SOCVR might be a good place to ask), or mod-flag the question.
If you do the latter, make sure you include a detailed explanation of why the post is an actual answer and how it can be salvaged. Including a link to the audit is a good way to point out the exact answer in question.