The Guardian Gamesblog has a piece on knowing your enemy to better pwn him. Specifically, they go through some tried and true rules about surviving boss battles. From the article: "If the boss stops, panic. Bosses usually move about - when they stop it means they're about to unleash their signature move, the aforementioned fist or laser blast. Try to avoid being parallel to them when they stop. Unless, of course, it's the sort of boss who blasts the whole screen apart from the thin corridor directly in front of them. In this case stay where you are."