Spoiler alert: This post contains details from the July 5 episode ofContainment.

Read at your own risk.

EW spoke with Kristen Gutoskie about saying goodbye to Katie.

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Credit: Justin Stephens/The CW

ENTERTAINMENT WEEKLY: When did you find out Katie was going to die?

They gave me a nice courtesy call.[Laughs.]

So I knew pretty well in advance before we shot anything really.

You spent a lot of time coughing up blood in this episode… [Laughs.

]It was like a minty cough syrup, if I can compare it to anything.

It wasnt enjoyable having it all over my neck and face for hours on end.

How did you prepare for that final minute.

Did you research hemorrhaging?

I didnt do hemorrhaging research actually.

But in terms of the last scene, I just kind of did my own thing with it.

I just used my intuition on that one.

I was choking and I was like, Okay, this is going to be really authentic.

You went super method!

Yeah, I went super method.

That entire hour was so taxing.

What was the most difficult scene to film?

It was really emotional.

But it was so hard because he was so truthful and beautiful and real.

When Jake holds her…

Brutal, isnt it?

Yes, its so violent but also very beautiful…

Thats the Julie Plec formula.

I just kind of spasmed a little.[Laughs.

]It was kind of a mixed emotion moment.

You feel really dark, but at the same time, a lot of love, too.

Was your interpretation of that final moment that Katie was imagining the kiss in her head?

I think it would be the equivalent of going to the white light when you pass away.

I think it was her little dream manifesting itself.

So I think that was essentially her happy place.

Quentin, get out.

]But maybe it wouldve transitioned into some sort of cute family picnic.

How awkward was it to film the original shower kiss through the plastic curtain?

So they went and replaced it with a less opaque shower curtain.

Love scenes are often very awkward, shower curtain or not.

And the shower curtain, its like a full body condom barrier.[Laughs.]

I was impressed you could even find each others lips!

]It took a few hit and misses.

There was some trial and error while shooting.

Its like, Oh, whats that?

Im so sorry Chris, lets try that again.

Why do you feel it was important for Katie to have this love story before she died?

Katie was always a girl who didnt have the dreams come true.

Quentin was a dream come true for her.

She never really had anything for herself.

I think it was so important for her to get that opportunity.

She grew so much throughout the season.

Containmentairs Tuesdays at 9 p.m.

ET on The CW.