A great guide all round. Interesting techniques, well explained. For Warped Terrorbirds however, there is an easy way to trap 2 at a time. When you run into the sewer, climb the ladder(Obviously : ), then run the the very end room. If you stand parrell to the railing the 2 birds will spawn, move diagonally to attack you and get caught at the ends of the railings. So if you stand in line to where I am standing you can make easy work of them.