How to make a hit to the center of the screen in Unity?

Question

Unity

There is a skeleton with Mixamo, there is a hit animation, the character uses a full bodysuit, you can see the torso, legs and arms. When I hit, everything looks clumsy (PS The head follows the mouse, behind the center of the screen) and it turns out that I look to the side or down, and the blow goes in a straight line, like in animation. I need the fist to always hit the center of the screen, like IK but on the fist, so that the blow follows the point on the screen, that is, where the character is looking. I kind of understand how to do it, but I don’t have enough experience and I can’t assemble the puzzle.