If we were to put percentage on faults, I think it would be 10 percent to the poor student and 90 percent to the bus driver. Most school bus has a mirror that extend beyond the front bumper of the bus just to prevent such accident. The mirror is actually shaped like a slice of orange where you can see EVVVEERRYYWHHEERRE include someone walking just in front of the bumper. The drive did not check her mirrors before driving off. I drop my kids off at the bus stop every morning and after this accident is where I noticed this mirror.
Here is a link to what the drive should have seen...
Google Image Result for http://www.istockphoto.com/file_thumbview_approve/5509073/2/istockphoto_5509073-school-bus.jpg