A student starts misbehaving while other students are still unloading from the bus. What should the driver do?

AAMVA CDL Manual, Section 10.5.1 – Don't Deal with On-bus Problems When Loading and Unloading, p. 10-9

Loading and unloading is the single most dangerous part of a school bus route because students are moving on foot near traffic and the bus itself. Splitting attention to discipline a student during this window increases the chance that a different child gets hurt. The rule exists so the driver's full focus stays on getting every student on or off the bus safely first.