Then just at right moment (as they are about to grab you) drop down into a ball on the floor, & your attacker will go flying straight over your body. A lovely Aiki Nage, which I used 20 years ago at school to catch out the bullies.
its great when it works doesn't it? unfortunately, for the sometimes that it doesn't... this is what happens.
aggressor, brakes at full speed using his leg and your ribs. Then keels over with a drop elbow on your exposed head. Says opps and dangnammit... Leaves the scene with a smirk on his face. (unless of course he was also an aikidoka who's conditioned to fly at a drop of a dime)