Passed to the callback methods of DetachedStageTIn, TOut. HoldDownstream and HoldUpstream stops execution and at the same time putting the stage in a holding state. If the stage is in a holding state it contains one absorbed signal, therefore in this state the only possible command to call is PushAndPull(Object) which results in two events making the balance right again: 1 hold + 1 external event = 2 external event

public interface IDetachedContext : IContext, 
	ILifecycleContext

type IDetachedContext =  
    interface
        interface IContext
        interface ILifecycleContext
    end