CARRIE UNDERWOOD'S husband MIKE FISHER is a total badass.  And I mean that in a good way.  Mike dropped the gloves and went toe-to-toe with an opponent who made a cheap shot hit on his fellow Nashville Predators teammate. It happened Sunday during the playoff game against the Anaheim Ducks . . . and Carrie was in the skybox watching.  I have no idea if she's seen Mike mix it up like that before . . . but she DID look a bit nervous.

(--Here's the video:  Fisher is #12 in the dark blue jersey.  At the 12-second mark he drops the gloves and goes after #15 Ryan Getzlaf.  The camera gets Carrie's reaction at the 47-second mark.)

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