ProcessCrewWorkOnItem.cs

private BehaviorResult<CrewContext> ProcessCrewWorkOnItem(CrewContext context, WorkItem ticket)
{
    var result = GetWorkOnItemResult(context, ticket);

    result.Switch(
        completed =>
        {
            ticket.Status = WorkItemStatus.ReadyForReview;
            AddMessage(context, $"{context.CrewMember.FullName} finishes work on {ticket.Title}");
        },
        progress =>
        {
            ticket.ProgressMade++;
            AddMessage(context, $"{context.CrewMember.FullName} made steady progress on {ticket.Title}");
        },
        setback =>
        {
            if (setback.Severity > Priority.Normal)
            {
                ticket.ProgressMade -= 3;
                AddMessage(context, $"{context.CrewMember.FullName} encountered a major setback on {ticket.Title}");
            }
            else
            {
                ticket.ProgressMade -= 1;
                AddMessage(context, $"{context.CrewMember.FullName} encountered a setback on {ticket.Title}");
            }
        }
    );

    return MatchedResult(context);
}