My seat stayed exactly where it was supposed to be

I was trying out the bareback saddle today working at a steady trot and Dobbin spooked big time at some animal lurking in the bushes. . . . It was by the far the biggest spook I’ve had while on him and he can really explode sometimes. Didn’t even think for a moment that your saddle would slip and it didn’t!!! My trusty dressage saddle would have slipped big time, without a doubt. Actually, my seat stayed exactly where it was supposed to the entire time, too.