Centrifugal forces help to keep an open loop as it applies a tangential and normal force. Also helps aerodynamics and allows the loop to travel further. You can replicate this yourself by shooting a rubber band. First shoot it normal and you’ll see it kinda fizzle out. Now shoot the rubber band again but offset your index finger so one side is tight and the other side loose. You’ll notice the rubber band flies significantly further by inducing this spinning motion as it flies.