Pretty good overall, except for a nit pick:

> Person B: “…. Hey, sorry to interrupt, but the story in my head is that you think owning that number is part of my job, and now you’re upset with me, or you think I’m incompetent at my job.”

Depending on the exact phrasing and group and company dynamics, I'd be worried a bit by saying something like this because Person A might think I'm trying to push off work or responsibility for some metric that I'm tangentially responsible for.