Scenario

As Mr. Cromwell, a kindergarten teacher, was introducing the opera terms to the children, he noticed Billy and Bobby teasing each other and not paying attention. He called on them once in a while to participate, but they just made loud noises like an animal screeching and continued to tease each other. As they continued in their antics, they became more distracting to the other children.

Using the guidelines that you know of knowing the rules, listening and validating, and asking questions, what could Mr. Cromwell do to stop the situation or even prevent it from happening?