Derek Haas also addresses Matt Casey’s latest injury and how it’s linked to an earlier season.

“As writers, we always start to think how we can turn this into some intrigue.

Gallo, as he says, just isn’t himself around Violet.

Chicago Fire

Adrian S. Burrows Sr./NBC

So we’re going to play that up in the next few episodes.”

We don’t stand in the way of anyone’s dreams, that’s how we play it."

“We have long memories on our show, especially the writing staff,” Haas says.

Chicago Fire

Adrian S. Burrows Sr./NBC

So in my very devilish way, I thought, that’s ripe for resurrecting.

That’s why Casey gets another head injury and that doctor’s words come rushing back into play.

Chicago Fireairs Wednesday night’s at 9 p.m. ET/PT on NBC.