On level 2, River of Souls, use your nuke (you must have the all weapons cheat) on the Styracosaurus (its the dinosaur you can ride) at the beginning of the level. Wait until the explosion is just about to happen then approach the Styracosaurus and get on. Don't press anything and don't move. The nuke explodes and the Styracosaurus starts to fry, make sure you don't move until it blows up. Now you have the dinosaur's weapons but you aren't riding anything and it seems like you are flying! Keep trying if it doesn't work, you have to time it perfectly.