Hi Victoria:
You've got a good exercise there. Reengaging, resetting, or refocusing can consist of of a major transition, or something as simple as just a break in the pace, tone of voice, asking a question when not expected, - just something to reset the attention of the topic, then move on.
At times, it is necessary to make a major shift, and being sensitive to when this is needed is an important observational skill good teachers learn to recognize.
Regards, Barry