Answer:
The most convenient time to provide feedback to an upset employee regarding an specific situation can be at the end of the day or the beginning of the next day prior the start of the day.
Explanation:
An upset employee can create serious problems to customers and coworkers, and as employers we don't have a proper way to determine the cause. If the nature of the job is critic he must be on his feet right away and show an opposite behavior, if it is a customer service job related he must take a break and wait for the superior feedback and further instructions to avoid that kind of situation.