User blog comment:ObiWanCokeNosey/You know what really grinds my gears?/@comment-26137698-20150518182641

Of course ruby is flawed all of them are honestly RWBY still fairly new and ruby might not even be the main character and I assume the reason she didn't use her semblance in those one you listed is due Monty wasn't thinking about or ruby had a deer in the headlights moment.