This pattern is used to handle missing deadlines. Let us assume we have a deadline of 7 days for some Important Work to be done.
We would like to model that after 7 days the manager resolves the issue by Do Something Else.
We solve this by including an Exception handling activity which is executed by a Robot once it gets enabled and pending. This happens exactly after 7 days, unless Important Work has already been done as this excludes the robot activity.