Not to de-rail this thread, but as professional photographer I long ago learned to refer to photographing subjects rather than shooting them. Especially when the subjects are politicians or children, it's better to photograph them rather than shoot them. We all know what you mean, but it pays to be sensitive.
As for the question, since you are talking about what camera to give someone else for this purpose, I can't make a recommendation. If the guy understands photography, I'd suggest he modify his technique, as others above mention. If not, then it really is a question of finding a fast camera. In that case I'd say pay attention to shutter lag as well as AF speed when trying to find the right gear. Dpreview.com generally has good info on both for cameras they have looked it, if I recall correctly.