It helps him get the trick around, watch Los Alomos, Mickael does that grab like 10 times on his lincoln 180 or rodeo whatever the fuck you want to call it, he pushes the ski to help him rotate
ya, i do that grab in my flatspins too, makes it way easier to bring the trick around. you just set the trick and go for the grab than hold on and enjoy the ride. crichton was doing 18ft out flatspins in the WSI superpipe...very sick.