To all the people asking this, please just read my post about the sheer subtlety of body language, and our innate ability to read and modify it (you can use the function that lets you see all my posts - there have only been about 5, and it's the one that has two numbered scenarios near the top).
I simply don't believe that posters here aren't aware of the tiny, indescribable non-verbal cues we all use, every day.
If you encountered an aggressive dog and felt worried it would attack, you'd immediately attune every single part of your body and face to tell it not to - every inch of you would be "speaking" to it, in tiny ways that it's impossible to put into words, but that you and the dog would both understand. If you were engaging with a fearful dog, you'd do the same, and you'd do it very effectively indeed. If I then asked you to put into writing what you'd done, though, I imagine you'd struggle. But you'd know, all the same.
And I honestly believe many people writing here do know.
It's perfectly simple. Rightly or wrongly, the OP read verbal cues that left her anxious, so changed direction and sped up a bit to get back past the man to where there were people. There's no mystery here - no hypocrisy or illogicality to her movements!
And to all the posters who are saying that her behaviour would have deeply unsettled the man, even as his shouldn't have worried her for a second? You're clearly being utterly disingenuous - and not a little sexist. This interpretation quite obviously favours the man. For him to be unsettled by a woman who just abruptly changed her mind about her direction to head rapidly home (maybe she'd forgotten to lock the car? remembered the time?) you have to assume the worst possible non-verbal cues from that woman, and the man's sensitivity to reading these. Meanwhile, in order to disregard OP's own anxiety at the man in her turn, as he stopped to open his bag, you have to do the exact opposite: you have to disregard the existence of such verbal cues, and the woman's ability to read them. There's a clear bias here that's quite fascinating, and arguably makes the OP's point far more persuasively than her (rather unfairly critical of the man!) first post did.
I mean, maybe she read his non-verbal cues accurately. Most likely she didn't, and the poor guy was just getting something out of his bag. Whatever. The bigger picture here that she asked us to consider - and yet people are refusing to even acknowledge, with remarkable, quite hypocritical stubbornness - that it would make a huge difference to women if more men were aware of the impact the subtleties of their body language can have on women. That's it. There's no big mystery here.
Except, perhaps, in some posters' determination to reject a woman's request for empathy, while extending it in spades to an anonymous man who, at least as certainly as she shouldn't have been scared by him, was highly unlikely to have been scared by her.