Hi Diane:
Your suggestion is a good one if time allows.
Sometimes, it doesn't take much to get folks redirected. A simple change of pacing, voice control/variance, change-ups, asking students a question, etc. If there is a lot of information to cover, there isn't always the opportunity to change directions fully and perform a different activity. But shaking up the atmosphere a little bit can sometimes be effective in getting students refocused.
Regards, Barry