User blog comment:Orchetrance/Voume 4 Is not as good as I thought it was.../@comment-4010415-20170202040656

RNJR splitting up makes sense if you put yourself in Ren and Nora's shoes.

Kuroyuri was the site of a traumatizing event in their childhood, so they wanted to avoid it. However, trying to carry Qrow over the mountain would dramatically slow them down and Qrow may not survive being carried over a mountain. Since splitting up was an option (despite it being a bad choice), they preferred to go with that, rather than go to the place that would bring up traumatizing memories. They ended up going to Kuroyuri because they felt there was no other choice because, if they didn't, there was a good chance Jaune and Ruby would be killed by the Nuckelavee Grimm.