It stirs one's pride in the job when your victim shows her disdain--and even anger--at your polite requests for information. Her expression tries to tell you she'll never give you anything.
But you're a pro. You soon have her showing her fear that she will not be able to bear your treatment of her. She would talk and tell you everything, but of course by now you have her gagged and you pretend you can't understand anything she says--only her cries
And soon enough her eyes are pleading with you, begging you to remove the gag. It makes you smile inwardly to realize that she actually believes that when she has given her information, she'll be release--or at least the torture will stop--at least for a while.