This technique can be used when your attacker throws a hammer-fist to your head or even attacks with a bottle.
Block the strike with a head block.
Use a left scissor-hand strike to your attackers right hip.
Using your right hand, grab the back of your attackers right ankle.
Now push with your left hand and pull with your right hand to throw your attacker to the ground.
Change hands so that your are holding your attackers right foot in your left hand.
Use your right foot to strike to your attackers groin then press your heel into their left thigh.
Wrap your left hand around the back of your attackers ankle.
Place your right hand on the shin of their right leg and hold your right wrist with your left hand.
To apply the ankle lock simply arch backwards. Take your shoulders back and push your stomach forward.