Lord Lockhart was observing every move of Talia, since she entered the room. He could see how stressed she is and he knew why it was.
She has a lot to to handle for an incident that happened and was beyond her control.
He served in the military and interrogation was his special skill and still the police department consult him in complicated cases. He knew what goes through the mind of someone in front of him.
This one in front of him, used to seem uncaring, because she was. She was a child - a child adored by many and she needed not to care for anything.
But now... He could see how broken she is inside.
This child - This child who killed his firstborn. This child who is also the only daughter of his beloved wife's best friend, the granddaughter of his old friend the only person his eldest son loved as much as he loved his mother and also probably the only girl who truly loved him too.