Rachel Watson (Blunt) is spiraling out of control in a bathroom at Grand Central Station.

Theyve renewed her hope in love after her own marriage has disintegrated.

I would just smash her head all over the floor!

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RUVEN AFANADOR for EW

Rachel shrieks, voice cracking.

Rachel has hovered just above her breaking point for weeks but now, shes finally shattered.

Its the peak of her unhingedness, Blunt tells EW.

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RUVEN AFANADOR for EW

It couldnt be sad, it had to be angry.

You had to imagine that she could be capable of doing dangerous things.

Now I want you to smear the lipstick all over the mirror!

and she was like, Oh my god, lets do it!'

She ends up recording what seems to be a testimony of a crime, Wilson says.

Its no wonder that Rachels greatest fear is herself.