trying to load an ETR back in the near-dark with a huge crowd around and wondering which way the film went. When I switch cameras too often those brain farts occur far more than I like to admit. Thankfully I sorted it out and didn't try to expose 15 frames of backing paper or anything
That sounds like you got lucky. Sometimes, I look at how the film loads in an ETR back and it seems backward, in full light, even when it's right.