re: Softball question: why square to bunt and pull back to swing away

I understand power hitters still bunt. I'm just curious as to why a power hitter in an obvious hitting situation wouldn't get in there and focus on hitting. The squaring up seems like a distraction of a batters focus. It changes your stance and also your line of sight because your eye level moves from a lower level to a higher level as the pitcher is delivering the ball.