No matter how complete the release is, expect questions. No reporter will accept the information in a release as comprehensive. He or she will want to go beyond it under ALL circumstances. The media spokesperson should keep in mind, however, that he or she does not have to answer every question, can't answer every question and probably shouldn't answer the largest percentage of questions that are posed. But a refusal to give information, or anything else, should be said in a helpful and understanding tone.
Reporters are human, they have a job to do and they do it the best way they can.
Usually that means pressing the person being interviewed to say things they will later wish they hadn't said. And reporters have lots of practice at being pushy. The spokesperson should be nice, but firm. One technique for getting insistent reporters off the phone, or out of your face is to take advantage of the fact that the spokesperson doesn't know the answer to every question. That means that in many cases he or she will have to leave the phone, or leave the office, and check with director of the crisis management team and call the reporter back.