WARNING: This article contains spoilers aboutChicago Fires fall finale Best Friend Magic.

He agreed, and it was so great to have him back.

And as happy as he was to work with Minoso again, the reunion was bittersweet.

Chicago Fire

Credit: Adrian Burrows/NBC

The words feel more powerful when they have real-life resonance.

We understood how powerful the scene was going to be when we filmed it.

Putting on the costume that day was bittersweet.

Chicago Fire

Adrian Burrows/NBC

I keep thinking about that final cup of coffee.

Its all so simple, and so momentous, and Ill cherish it forever.

The surprises didnt end there either.

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Adrian Burrows/NBC

And I was like, Oh, great!

Were going to put it a little update on Antonio.

He was like, That sounds awesome!

I just didnt want to step on their toes if they had any other plans.

But he said, No, thats exactly what we had in mind.'

Haas shares that the situation is left open-ended intentionally.

For me, its left open.

No regrets on either of their behalf, he says.

They had a great love story and romance for six seasons that we got to watch.

Then the voicemail that she leaves says to me, You know Im leaving my door open.

And we, the show, are leaving our door open.

Even if that meant potentially losing out on a really great guy that shes interested in.

As the season continues, their friendships going to grow.

Theres a conversation about what happened this weekend that is is going to happen.

We wanted to do differently on this one, weve had arsonists before but theyve always been mentally deranged.

And Severide isnt afraid anyone, as weve proved many times.

Usually, bad things happen in basements.

So we are going to pick right back up with that, and the fireworks are about to fly.