What's frustrating though is that the game is inconsistent in what it will let you figure out for yourself. Working out you need to blow up a wall is encouraging, but once you go through the resulting hole, you can't target the power generator - which might as well have a sign on it saying "blow me up to continue" - until you've hit the white button to bring up your scanner, targeted the generator and held the right trigger for a few seconds to reveal that - gasp - you can blow it up. Then you come out of the scanner and your auto-aim will suddenly pick it up, allowing you to fill it full of lead.