In reply to Indy:
My reading of that video is that his intention was to cross in front of her, relying on her to stop (or maybe he only saw her at the last minute, or misjudged speed and distance, but it looks like 'I dare you' body language to me). Something he wouldn't have contemplated with a car or truck at the same speed and distance.
Having seen she wasn't intending to stop, and that she said something, he sensibly pauses briefly, and they pass each other safely. Note that he is able to cross immediately; there was no need to try to step out in front of her, and could easily have walked down the centre of the road for the couple of seconds it would have taken to let her pass without incident.
In these circumstances, it's hard to instantly produce some apposite comment, so what she says isn't likely to be entirely rational. In any case, I think she says 'please don't knock me off'.
I suspect that he then gave her some verbals that we can't hear, and she flipped him the bird in response, which we don't see; it would be behind the camera.
This enrages him and he gives chase, and the rest unfolds as we see it.
The Merc did a pretty close pass on her, just before matey boy gets to her; not a good day...