my guess is you're doing it wrong, you have to look over your shoulder, and you can spot for most of the trick. that or you're doing it on a small jump and hucking the shit out of it.
ill put some help here, backflips dont really get you ready, though they help with airsense and how much time you have to get it around. make sure you start with a wide athletic stance. im just going to give the example like i do it, spinning left and flipping over your right shoulder. make sure you are familiar with the jump and know the speed and pop of it well, dont be afraid to try it on a more medium size jump (35-50) as then you wont have to huck as hard and you have a better feel for what you're doing on the rotation. having a poppy jump will help with this trick. approach the jump with good speed, so you'll make it past the knuckle and to a comfortable spot in the landing. get low and pop off your right edges. now when you pop off your edges (make sure you get the pop first and are not just hucking, thats how his friend hit his head on the lip) look back over you left shoulder, while leaning toward the right, and pointing your hips up in the direction your looking. the more you turn the more you'll rotate. by the tine your body is up you should be able to spot, hold the position and bring it around, stomp. you learned a rodeo. you may or may not have the rotation the first time, but you should get to your feet and be able to tweak the flip and rotation to get you nicely to 5 within a few more attempts.
