I exploited some
Kisat Dur to send him flying. Basically, if you jump into someone, they'll be slammed into and knocked back if they don't dodge. Grabbing them prevents them from dodging, but also prevent you from jumping.
However, selecting what to grab doesn't immediately resolve the grapple check. Instead it expects you to hit enter FIRST. But if you hit the jump command instead, it'll roll the grapple check, then leave you at the "select which direction to jump in" prompt.
You can also do this while grabbing weapons or armor instead, so you can jump away to disarm someone effortlessly, or jump into them to disarm them AND knock them back.