Board Thread:General Discussion/@comment-27255656-20161022120407/@comment-28288412-20161022121745

Ozpin is one of the strongest huntsmen on Remnant and he lost against Cinder (we never saw the end of the fight but we know he didn't win, that much was clear).

Ruby is a 16 year old huntress who never even completed training. Cinder is an adult huntress who has demonstrated being a competant fighter both with and without maiden powers.

Ruby woildn't stand a chance, not yet. I'd say Volume 6 is when we would see a rematch.