Here is a clip from a seminar I taught in Tiger Muay Thai Thailand.
The main part of this technique is to make sure you shoot into them with a knee strike. Don't wait stop and block. You need to move your energy into the attacker to stop the next assault.
Don't give them time to be able to think and then swing their arm again.
Remember we are what we do, so be consistent in your practice.
Hope you enjoy and please feel free to ask any questions...
Ricky x