There has been one time, one time that Greg has ever seriously threatened someone because he didn't believe in threats. He didn't like putting fear into a person, because he had felt that fear, that anxious feeling, worrying when everything would go to hell. However, there are certain lines that are not to be crossed in Greg's life, certain people that no man, criminal or otherwise, is allowed to threaten. For Greg, that is his Son.
They had been questioning people for a recent murder, that's how it usually happens, an irritated suspect brought in for questioning idly tosses out a threat against him. He brushes them off and keeps going. This time they were holding one, in his gut, Greg knew that this was the man who had killed the two women, his psychological profile fit, they just needed the evidence, there was one piece missing, the piece they needed to make the arrest, the murder weapon. However, it had been 48 hours, they hadn't gotten it in time and he had to be let go.
The bloke had that self-important sneer on his features, so proud he hadn't quite been caught. Laughing in their faces that he couldn't be pinned. Greg would personally see to it that he was. Wait until he slipped up.
He didn't even leave the yard before he did.
The criminal had been strolling away down the hall, led by Sally Donovan when he idly threw back.
"Oh Inspector? Do be careful, where you poke your nose, wouldn't want you finding the body of your son at the bottom of a skip instead of a knife..." The niche that his team was collected in fell silent. Sally had stilled. Greg paused for a moment, then walked up to the man, nodding to Sally. She looked between the two, eyes resting full of fearful question on Greg, pleading him not to do anything that would get him in trouble. Greg smiled and Sally stepped away, as Greg took the man's elbow and led him to the lift. When the doors finally closed, he spoke.
"Here's the thing, I don't much care what happens to me, but you threaten my family, you go near them, and I will turn your life into a living hell." The other man sneered, letting it glanced off of him.
"What? Kill me? Arrest me again? Good luck. You haven't put much of the fear of god in me, Inspector."
"No, nothing so obvious." Greg looked at him. "I will start rumours about you in the underground, and whispers of betrayal will reach the ears of all your allies and your employers. And when they've turned on you, when they've got their knives at your back, you'll beg us to hear your sins in exchange to the safety of a cosy cell. You know what? I'll deny you that, I'll turn you away, and I will watch as the underbelly of London surrounds you while you cower, swallows you whole, and tears you apart." Greg fell silent after that, the sneer slipped off of the face of the man. The lift doors opened to the lobby of the yard, Greg un-cuffed the man and let him step off the lift.
"Stay in touch, Mr. Stanton. We'll see each other quite soon."