This is bunkai from kata Passai, also known as Basai Dai in Shotokan. It is close distance techniques sequence. You should execute
- Mikazuki kick,
Uraken to attackers face,
Escape from grab and
grab attacker groin as ultimate measure.
It is pretty cruel sequence, but it is sometimes necessary to be very lethal if you are not as strong or big as your opponent. Version of kata that we practice is known as Oyadomari Passai or Tomari Passai and it is the oldest version of this kata as far as I know.