Him being squeezed would be an accurate description.
It's like a preliminary hearing. All the grand jury hears is one side. There's no cross-examination and the prosecution brings out what they want to bring out, so it's very one-sided.
They may subpoena her to see what kind of maneuvers her attorney does -- either to quash the subpoena, indicate that she's going to take the Fifth against self-incrimination. Or, she may attempt to make a deal.
He's relieved that he's not going to jail.