Matt Smith, Mourad Zaoui, Christopher Abbott, Said Taghmaoui, and Ismael Kanater co-star.

Ralph Fiennes:It was inflammatory.

Jessica Chastain:I loved it.

Jessica Chastain attending event

Yes, I love working with Ralph.

But it’s good fun.

Fiennes:It was a great reunion.

Ralph Fiennes and Jessica Chastain talking

One thing that I do remember was that you came to the set of “Coriolanus” and …

I was covered in blood.

I was covered in fake blood, but I looked pretty horrific.

Ralph Fiennes and Jessica Chastain walking in The Forgiven

Chastain:I remember.

We met in the trailer, and he’s completely head to toe covered in blood.

Were you eating a steak?

You might have also been eating a steak.

Fiennes:I was eating a steak.

Chastain:I have my salad and I’m like, “Where am I?”

Hopefully we’ll have another collaboration in another 10 years, then?

Chastain:There you go.

Hopefully, it won’t be that long.

Were there any difficult moments on set, and how did you prepare for that?

Chastain:Ralph had the most difficult moments on set being in the desert.

You got to drink cocktails.

Chastain:Exactly I got to drink cocktails and dance.

Ralph still had to do all the stuff in the desert.

Fiennes:Our scenes are what you see.

I don’t think there was anything [grueling].

The scenes had tension in them because of the relationship.

I don’t think there was anything that felt momentously awkward or dangerous.

It was a great cast wonderful cast of people around us, really fantastic actors.

Ralph, would you ever play Voldemort [in the “Harry Potter” franchise] again?

Fiennes:I think Voldemort should reappear and there should be Voldemort’s Bride, played by Jessica.

But then would it be a loving marriage?

Fiennes:I think it would be.

It would be very complicated.

It would be obsession.

They would hate each other.

Then they would come together with incredible spells.

They would have amazing sex, and then they would have their traumatic separations.

They’d use their magic to manipulate each other and fall in love with each other.

Chastain:It sounds very exciting.

Probably not appropriate for children, but who cares?

Fiennes:Who cares?

“The Forgiven” hits theaters on July 1.Book tickets now.

This interview was edited for clarity.