It can happen that a pedestrian just walks out in front of a vehicle. I know of someone who knocked over a pedestrian with a car (no injuries, luckily) because the pedestrian just started crossing the road without looking, for reasons she herself couldn't explain. As she was very close to the car when she started crossing even an emergency stop didn't stop the car in time and it knocked her over travelling at very low speed. But there was nothing the car driver could have done -the pedestrian walked out of a side street (so unseen) across a narrow pavement and straight onto a busy road without looking or slowing down. It's all well and good saying you should anticipate it, but if you have to drive/ride anticipating that everyone you pass might just step out in front of you when you've not enough room to stop we'd all drive /cycle at 2mph.
As I say I don't know the details of this case, but it is perfectly possible to conceive of a situation in which it is the fault of the pedestrian,as the OP presents it. Whether or not that is what happened I don't know. But it's plausible.