Like Marc Houtzager a day earlier, Ehning has to fend off the Brits to claim victory, after four home riders qualified for the jump-off.
Michael and Robert Whitaker, Tina Fletcher and Laura Renwick were joined by Ehning and just four others - out of a field of 30 - in the finale.
But it was world number three Ehning who came out on top, ahead of Edwina Tops-Alexander and Penelope Leprévost.
Ehning set an exceptional time of 37:99 with Sabrina, while Tops-Alexander managed 40:89 atop Ego van Orti to take second.
Janika Sprunger from Switzerland on Uptown Boy finished the course without penalty in 41:67 to claim third.
British fans were left disappointed after Michael Whitaker with Viking came in fifth as the best British rider.