LOS ANGELES (AP) -- Mixed Martial Arts champ Gina Carano wasn't about to let Michael Fassbender hit her harder than he had to while filming "Haywire."

In one scene, Fassbender slams Carano's head into the wall. Carano says Fassbender did it so hard, she "lost it for a second." She slammed a vase into his face. She was afraid she'd get fired because of that. But Fassbender says he knew it was coming when he saw a flash of anger in her eyes.

Haywire opens on Friday.

NBC's Mike Wilber sat down with Carano to talk about her role in the film. Click on the video player to watch the interview.

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