Anyone got any good tips on defeating the reaper at the end of this mission? I can't get the laser to fire, it' just to slow. Yeah I know I'm supposed to run back and forth and roll to dodge the laser, but there just isn't enough time to get the thing to fire. I get the little blue circle to appear over the eye, and I run back and forth dodging, but I can only do that 3 or 4 times before the beam catches up to me.
You can start to aim your laser and stop aiming to run to the other side, then finish aiming once you're safe. You don't have to aim and wait for the laser to sight in on the target all at once. It will pick up aiming where you left off seconds before. Also, be sure to run as far to the sides as possible and not stop near the middle of the ledge to aim.