Idle thought on Lie Ren.
A lot of viewers seemed to think that Ren's character arc began and ended with the Nuck Grimm, but I feel that can't be further from the truth, and I'm gonna go into why here:
So, we all know Ren, he mostly played a secondary and or supporting role in the early volumes a JNPR never got that involved in the plot. Most of what we saw was a almost supernaturally chill and slightly awkward but supportive guy who was very skilled but may have lacked the stamina of some of his allies.
Due to never getting closely tied to the plot, we didn't see much beneath the surface because he was mostly dealing with school drama, but then the Fall of Beacon happened and we see him so wounded he can't even stand, stubbornly trying to go save Pyrrha & Jaune anyway, this I feel is a pretty good sign that Ren is not nearly as chill beneath the surface.
Following that, V4 is what gives Ren and to a lesser extent Nora, real time to shine.
We learn about his home and is destruction at the hands of a Grimm.
We learn about his fathers last words of wisdom demanding he take action.
We see that his Semblance let's him hide & suppress Aura & emotions, which puts his supernatural chill into question.
Then when he encounters the Nuck, he unsurprisingly looses his cool entirely, racing in headlong against a Grimm well suited for fighting his style and almost getting himself killed. Its only Nora dragging him back to a near state of calm that stops this and he particpates in a plan that allows him the chance to effectively execute the Grimm that ruined his life.
Now one can talk about the morality of the act both in general and in regards to Grimm until they are blue in the face but I am more interested in his words. Specifically his speech about taking vengeance for the people killed, he notes his parents and then, himself. Or in other words, some part of Ren sees himself as having been effectively killed by this Grimm.
So even ignoring that while vengeance may be cathartic its still no replacement for therapy, the fact that Ren views himself as such, had to be made to calm down and afterwards while more openly affectionate with Nora, never actually talks about, well, any of that, to me shows his story isn't over, so much as it is just beginning.
Things are pretty chill in V5, which is unsurprising given RNJR's segment is thematically tied to the same sense of comfort & complacency that Ozpin previously had at Beacon that he can't see he's lost. Plus why wouldn't he be calm, he slew the monster that took his parents, they are in a literal safe haven, they have skilled and experienced adults provided stability and a plan of action against a dangerous foe, but one he has every reason to think they can defeat, an idea driven home by Ozpin's claim that they would be defeating Salem as he once failed to do.
Then it all starts coming apart at the seems in V6.
They lose half their team, they lose Ozpin and find out that Ozpin was lying about not only Salem being a foe they can defeat in the traditional sense, but even about so much as having a plan to stop her. He's obviously left tense, frustrated and adrift by this, barely even reacting when Jaune assaults Oscar and only seeming to calm when he's providing some kind of support to his allies or engaging in an operation.
Or in other words, the shock from the realization about Salem's immortality was never addressed. Team RWBY had a miniature arc dealing with the dangers of apathy, surrender and hopelessness, Jaune had a meeting with his martyr'ed team mates mother that helped give him closure and resolve, but Ren & Nora didn't get that,but while Nora wears her heart on her sleeve, Ren only reveals his problems when he cannot control himself anymore.
Thus, as it is we have established that Ren is a bubbling pot of emotions beneath the calm and has never really been shown addressing or dealing with this issues. We see that he sometimes struggles to keep up with his allies & will fling himself heedlessly into danger for them even when he can't fight and that on some level he views himself as having died as a child and finally that Ren usually only returns to "normal" when given structure and a goal to work towards.
With all that set up and established, I feel that Ren beginning to embrace Ironwood's hard line, heavy handed approach and (He thinks) emotionally disconnected approach. Why wouldn't he? Ironwood is providing him a goal, steps to accomplish, the sense that he is actually making progress and accomplishing something, all while presenting the image of someone who has everything together, despite much like Ren Ironwood being a mess beneath the surface.
This was further not helped by the fact he and Nora have always clearly communicated very differently, when things are calm this isn't a problem because they generally had no disruptions in their shared rhythm. But Salem, Atlas, Ren's trauma, that is throwing everything into wack and its clear they've never really had a problem like this before, and don't know how to resolve it, especially when Ren's default method of dealing with emotional problems is to shut down or hide his feelings while Nora doesn't know any other way to communicate than her own because up until now she's never needed to know Ren's.
Ren is a deeply wounded young man who I don't feel has ever tried to deal with his trauma or learn to manage his emotions in a more healthy way; he wants to protect those he loves and feel like he's actually doing something worthwhile with a life he doesn't wholly feel is his own and Atlas provided all of that to him when he was near his lowest point.
Now with all of them declared enemy's of the state, the Relic lost and Salem at their doorstep, I think Ren is going to have entered a new stage in his character arc and development.