Cardin is Love Cardin is Life

So the dude has just been staying in the same place for a whole week..?

Is this an alternate RWBY timeline where they didn’t lose beacon and phyrra didn’t *cough cough* you know?

Have you ever heard of a comma?

Well the typical case of making a character weak for plot reason...
This problem is especially obvious to the authors that tried to use games in crossover...
They judge the game character reference according to game play and not the stats or the world bacj ground

He really just didn't have any protection for all his gear? In a school full of irresponsible students . . . ?

I feel like Dunstan debated really poorly with Glynda. He spoke as if he was trying to turn her against him. Trying to make her hate him.
What happened to pointing out that once they're infected there is no cure, trying to save them only lets him go on to infect even more, and so on. Glynda not putting them down at that point will kill far, far more than she could ever dream of saving.

I gotta say, I agreed with Rose in that scene. Yang isn't her mother, but she smothers Ruby as if she was. Yang acts like she had two kids, and one died when they were both young, and now she focuses everything on Ruby and completely smothers her, all but prevents her from being her own person.
All of Ruby's so called "childish" quirks in the show? Her social awkwardness? Most all of that can be traced directly to Yang, and probably Tai as well. Yang may even have learnt it from their father. Not to mention her absurdly overprotective streak when it comes to anyone wanting to be Ruby's friend.
Ruby at Signal probably started making friends, Yang threatened them and/or beat the shit out of them until everyone learned to avoid Ruby. Ruby only has friends at Beacon because Yang allows it - but even then that's just 'cause they are also Yang's friends and she is most often present.

Cardin was in a damned hospital bed strapped to numerous machines, Ruby obviously sought him out, and the first thing Yang does upon seeing Ruby spend time with him? Immediately insulting him and trying to force Ruby to get away from him - even to the point of attempting to physically drag Ruby from the room. I was surprising you captured her canon personality so well with that.

Yang is the best sister in the world? Granted she has good intentions, but quite honestly she is an absolutely horrible sister.

"I am doing this to save lives Dunstan."
No, Ozpin, you are not. You are doing this to satisfy your own arrogance.

He receives orders from the Atlas council to go level a town in Vale, and he just does it? Doesn't even contact Oz? I'm smelling some bull . . .

So Blake finds weird rotten blood vials/injectors, and thinks it's a good idea to hold onto them and not share her find with her team . . . ? She gonna use one of them on herself and go feral or?
Since you said there will be character death.

Annnnnnnnnd we've now reached my least favorite part of crossovers.
Where authors try to mix the two and make a combined AU, rather than limiting the x-over to just the few characters that interact in both / have crossed dimensions to another.

I personally have never read an x-over where other people (normally enemies) from the alt. world crossed as well where it worked for the story.
There is enough plot with the grimm and Cinder/Salem etc., adding in plot from the other world just complicates things needlessly.

I was gonna leave a complaining review that he lost in the stupidest manner ever - targetting the useless Jaune who is obviously unskilled instead of incapacitating Pyrrha? Dunstan wouldn't ever even think of doing that.

But then you end with him saying he had a plan going, so now I'm confused.

So Ozpin realizes the mysterious hunter has no aura, eh?

Dunstan and Ozpin only met thrice NOT MUCH happened and suddenly in this chapter explains how he escaped (information only to be explaines when FULLY TRUST) and SURE I TRUST YOU with shake hands.

No earning trust takes much more time than this your story is good but this part of the story is utterly dumbfuck stupid