Neuer did what every goalkeeper does: He put up his knee in order to protect himself. And he got the ball. Higuain had no chance to get it once Neuer made his choice. In fact the Argentinian GK did exactly the same thing in the first half, only that Klose saw it coming and avoided him. And it's not violent behaviour by GK's. If wouldn't don't do it, they get into bodies with their arms up, and expose their whole gut. Kidney, liver, stomach. Normal player go only straight up, no much exposure, a GK is a completely different story.