He's been doing it just fine until that moment. It was just a mistake. He didn't look up and see that Bruno was right there. And that mistake affected him, and caused the 2nd one. It happens. He's not being asked to be Pirlo and spread magnificent passes left, right and centre. He's asked to make simple, short passes or chip it medium range, or just whack it when necessary. He's done it totally fine in the previous games. This was just unlucky. He's perfectly capable of doing it.
Neuer has played for over a decade for a team that askes a lot more from the GK, and he's pretty good on the ball, but ain't no Neymar. Most of the time he's OK, but he's made mistakes like Forster many times. It happens.