I am surprised Ruby profile doesn't already have pseudo-teleportation and intangibility, but the info-dump should settle any doubts. I guess we can add Limited Matter/Molecular Manipulation as well.
And yes, Ruby's Semblance does turn her into rose petals. Recall this quote from Qrow where he describes Ruby's Semblance:
Did you know crows are a sign of bad luck? Old superstition, but it's how I got my name. You see, some people can absorb electricity, and some people can burst into rose petals. And some people are just born unlucky. My Semblance isn't like most.
So the rose petals aren't some fancy vfx only the audience can see. In Ruby's short, the Gorilla Grimm was confused by the rose petals as well.
May Semblance >>> Ren's Semblance.
The AceOps's arguments against Penny are invalid; Winter/Ironwood either lied in their debriefing, AceOps want to bully Penny and psychologically disorientate her with guilt, or there is bad writing going on. For now, I am guessing Ironwood lied to AceOps to boost their loyalty, since writers seem to want Ironwood to be less morally grey this season so we don't root for him over the main characters.
AceOps have shoddy teamwork as always without their leader barking orders. Their first move against a single dangerous opponent should be to have Marrow
STOP them. Writers seriously shouldn't have made Marrow's Semblance so OP.
Nora's scars will cause Ren more trauma and angst. Hope we don't get flashbacks to ORNJ's fight against Neo; I still believe that it was one of the most incoherent and worst written segments in the entire show.
Evil hacked Penny hype.
How much of Maiden powers require practice? It seems a small storm cloud was created instinctively.
It is not established how unfinished Amity is. The common theory going around is that it is now meant to send a single long-range message instead of functioning as a satellite that reestablishes global communication, while hoping Grimm doesn't destroy the whole thing too quickly.