Sorry, what?
http://www.arrivealive.co.za/pages.aspx?i=1225
The 2 Second Rule
Most International road safety campaigns refer to the “2 Second Rule” as a guideline for safe following distances. A point on the road is noted, two seconds are counted, and if that point is still visible then there's probably enough following distance.
Assuming he adhered to the above I think a bullet travels a lot faster than 2 seconds. Or even if we give him the benefit of the doubt - say ten seconds... If they chose to shoot I think his children would still have been in danger!