Along the same lines, I noticed that the performers on the swinging mallets on the rapunzel float are not tethered (at least to my eyes).
I know that when we climb (telephone poles or ladders) we are required to maintain three points of contact. If you are belted in, then you can work with both hands free (two feet + one belt = 3 points of contact). Is this a similar rule for WDW? Since the characters on the floats wave with both hands, they need to have a lanyard to keep three points. It appears that the characters on the swings never take more than one hand off to wave, maintaining three points of contact without a lanyard.
-dave