You'll probably want a diagram.
I was driving today and rounded a corner to see a small child heading for the road (literally one step from the kerb). Her mother was about 8-10 feet behind her, standing still, Talking on the phone in one hand, buggy in the other.
I stopped and beeped my horn to get her attention. This made the child stop and look at me, thankfully. The mother screamed at me "I can see her!"
I shouted back, completely uselessly through the closed window, "But you can't stop her"
I then drove on, with her gesticulating at me in my rear view mirror.
Was I unreasonable?