B turns onto his stomach and A follows up with a ne waza skill. O soto gari, Ko soto gari or Ko uchi gari. B turns into or away from A while attempting to land face down. A follows up with ne waza. Player A throws B with De ashi barai or Okuri ashi barai.
B turns onto fours, A follows into ne waza.
Player A throws B with a forward throw such as Tai otoshi, Harai goshi or Ippon seoi. B takes the fall but under-rotates by using a back leg turnout to prevent landing squarely on his back. A follows into ne waza or B proceeds into ne waza by rolling A over or by climbing onto A's back. I have successfully used an unorthodox approach to ukemi for recreational as well as competitive students for over 20 years. resulting in fewer injuries than when I taught traditional ukemi for a period of six years. Dennis Mercer, the former USJI insurance agent, once stated to me that the most costly exercise in Judo when it comes to insurance claims is the forward roll or zempo kaiten over several players.