He also appeared to confirm one popular fan theory about the police drama's latest cliffhanger.
The BBC has insisted the remark in question was not a reference to the character Terry Boyle's disability.
Series five of the BBC cop drama saw the AC-12 boss framed as the mysterious organised crime boss.
If your head hurts from trying to work out who everyone is and what else you've seen them in, we're here to help.
We've uncovered all the secrets of AC-12 – because Hastings and co aren't the only detectives round here.
Here's something to whet your appetite ahead of the new season's debut on Sunday.
So this is what they get up to when they're not catching bent coppers.
Line Of Duty Writer Jed Mercurio Labels Journalist A ‘C***’ For Writing ‘Lies’ About New Series Cast
The BBC drama's showrunner didn't hold back.
And no, he doesn't use them in real life.