I had an N too, the only place that mentioned it was Harvard. They said it didn't make sense that I had a low score, because my PS was really good. I just said that my writing process involves several drafts, and refining each time. So that score effectively reflects a first draft written in about 30 minutes. No biggie, and didn't keep me out for MD.
You probably won't be asked (especially because you have a 10 in VR), but if you are have a brief, calm explanation.