I doubt it actually was, since I'm sure this type of thing is common, but I wonder if it was me. I feel like something like that happened to me right around that point. I was wearing headphones, and I remember someone apologizing to me as they passed. So if it was me, I know you didn't mean it! What corral did you start in, and do you have any memory of what the person was wearing?
And I 100% agree with your last paragraph. As much as I would love to actually run a whole half marathon, the likelihood of that is very low at this point. But I'm committed to continuing to work at it and building up my endurance, so who knows what I may get to someday.