Drivers are required to give "due care and attention" to driving which can be demonstrated by following the "highway code" and that code tells them pedestrians might do things they don't expect and to assume if it's not clear what's going to happen then yeah there is a pedestrian behind that obstruction and they are going to run into the road in front of you, whereupon hitting them would be your fault.
For example when I was a child I got off my first bus home from secondary school, and ran straight into the road in front of a car I couldn't see because the bus was in the way. The horrified driver was legally responsible for that, even though she hasn't intended to hit me. I believe she would have been automatically billed by the authorities for the cost of shipping me to a hospital to have my broken leg set and so on.
Clearly it is in some sense my fault that happened, but on the other hand it's not me choosing to drive a huge steel box at 30mph past a bunch of idiot children...