In that situation, I would take the following steps:
1. **Pause and Assess**: I would pause the transaction and quickly assess the situation to ensure that the customer has indeed left an item behind.
2. **Politely Inform the Customer**: I would kindly inform the customer that they seem to have left an item behind on the carousel. I would point out the item and ask if they would like to add it to their purchase.
3. **Assist as Needed**: If the


