As you are swinging when you let go and jump hold triangle and circle and push the left analog stick in a direction. Make sure you do 4 different tricks so go left up down and right on the analog stick. You dont have to do all 4 at once you can do 1 trick per websling if you prefer. I cant confirm if left and right cancel each other out since they both result in a flying helix. If you are having trouble try going to avengers tower or the empire state building and falling off. While falling hold triangle and circle and push the analog stick in all directions on the way down. You can also get a triple helix or trick switch if you do 2 at a time.