This drill shows defence against an over-arm front bear hug. You'll see small pieces of kata represented in this drill including Hangetsu (frame of the hips to create space), Heian Godan (o goshi), the crane stance/tsuru-dachi found in Gankaku (imobilizing uke's upper body) and juji uke (kimura lock/double wrist lock) which is found in many katas.
Critics may say that this is just jiujitsu. I say that the various styles of martial arts are not islands. I learned this variation of o goshi in BJJ. I learned the kimura from a karate instructor. The martial arts are not separate entities with no overlap. If it walks like a duck and talks like a duck then it must be a duck!