[IronicDeadBird]

I dunno what the fuss is here, zoom in and enhance on any students when the reflection of the safety glasses they are wearing is angled at the mechanism, Trace the brand of safety glasses and using a cad of said safety glasses overlay the reflection. Keeping in mind that you need to compensate for the magnus effect and the angle of sunlight in Guatamala you can clearly see what they are using for a mechanism.

On a serious note though that is looking wicked consistent, and has some interesting characteristics on how the ball actually flies through the air. Definitely going to want to see the full reveal though.