CORBA24 — What is the NO_RESPONSE exception good for?

Section 3.17.1.15 states:

"NO_RESPONSE

This exception is raised if a client attempts to retrieve the result of
a deferred synchronous call, but the response for the request is not yet
available."

Meanwhile, section 7.3.4 states:

"get_response returns the result of a request. If get_response is called
before the request has completed, it blocks until the request has
completed."

So if get_response blocks, how and when will and ORB ever raise
NO_RESPONSE?

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