the this is that to try to keep both feet on the floor. if youve got one in the air,the enemie is going to use to against you, hes going to use it as a pivot to slam ur head into the floor.if youve already got one in the air, extend ur other leg as far as possible. remeber, extend has more resistance than hold. as said above use ur arms, and lower them before you get out of the dojo, then raise to flip him.
when he is lift kicking you, try to contract ur glutes on em to lock his leg in position, then try to push him to the floor.