Did Mr. Jackson behave appropriately according to the Code of Ethics?

Mr. Jackson is an elementary teacher who has recess duty. During this time of day, he often takes time to catch up on text messages and return emails on his phone. One day, he sees an angry email from a parent, asking him  to contact her  immediately. He leaves the playground to make the call.

Did Mr. Jackson behave appropriately according to the Code of Ethics? If so, justify your answer.  If not, what definitions of terms in the Code of Ethics might describe his behavior?