I would deduce, likely wrongly, that the downwind turbine in the wind farm would take fresh wind as the wake upwind is diverted.
Concerning ST unfortunately the Schwarzenegger report on SuperTurbine (tm) and Serpentine, and other torque transfer systems seems to not be available. The report mentions:
“The turbine was built with seven rotors, each seven feet in diameter, and mounted on a single, 70 foot long tubular carbon fiber driveshaft.”, then
" Output was 5 to 6 times the power of a single-rotor turbine of the same diameter at all tested wind speeds.", then
“The tilting mounting mechanism (U.S. Patent 6692230) functioned as designed, allowing the shaft to rotate toward the horizontal from the default 25 degree upward tilt as wind speeds increased, thereby mitigating the amount of fresh wind striking all but the front rotor for overspeed protection.”.
So ST efficiency is very high, above all if we take into account of the efficiency (0.75) in regard to the losses (0.25) due to cosine cubed by using an angle of 25 degrees, and other losses due to aerodynamic effects such like wakes. I have no explains for this.