Flight of Fancy
The same way you can avoid any other projectiles. The path of a regular (non-homing) projectiles is calculated based on your predicted location. Rapidly move back and forth over an updraft. Normally you’d just strafe, but with gliding it’s easier to flip (about face).
I got it by frequently canceling the glide and then restarting it — my vertical position became unpredictable, so none of the projectiles targeted at me ever hit. (As it turned out, I was one of two surviving, so it was also easy to avoid the other person’s projectiles.)
John Smith: “you should kill monsters, because killing monsters is awesome.”