Unity 2d Toolkit Specific Frame

Hey, I am using 2d toolkit to make a sprite game. I have the players throwing punches but the problem is the punches should only do damage during the delivery, not the wind up. So I need to have some way to check what frame the current animation is on. This way I can tell whether the opponent should take damage or not when the collide with each other.

is there a way to return the current frame in an animation using 2d toolkit?

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