I have a form with 4 levels of review (Coach, Director, Exec, HR).  At each user task, I've created a timer event to interrupt the event if the time expires.  I am looking for a way to allow reviewers to 'Reassign' the task, but only to the previous user, to whom the task was previously assigned.  This could happen when the previous task is interrupted OR approved.  See example below:

User submits form for Coach review >> Coach does not review in time so the timer event interrupts the task moving it onto the Director.  At this time, I want the Director to have the ability to re-assign to the Coach.  Using the re-assign in Forms would just reassign to another person and would skip my director if the coach re-approved.  

The main difference is that I need the ability to re-assign to the previous STEP in my 'workflow'.  Any help is much appreciated.  

Thanks,

Nate