From what I understand, and have observed, a single person clicking Looks Good in the Low Quality review queue is enough to take it out of the queue.
The Edit button implicitly does the same thing, but this isn't stated anywhere. For instance, this answer, which is:
thanks for the help but i was wondering what is sudo?
It's clearly a non-answer but was edited to be:
Thanks for the help but I was wondering what is
By improving the quality of the capitalisation the editor has effectively stopped the answer from being deleted.
It's not at all obvious that editing the post will do this and it means that non-answers do not get deleted when they should be. It requires someone to realise that a post, which they recommended the deletion of, has not actually been deleted and to then flag it for moderator attention.
An Edit should be considered a null instead of a Looks Good as it means well-meaning editors stop the system from working.