As mentioned there is no single standard knife attack but statistically there are 3 types of attacks- the wild overhead, the piston-type power stab, and the wild slashing attack, or a combination thereof. These are obviously covered by Hock, especially during the practice of the clock drills. Anyone training for real knife attacks will work with and against these types of attacks. However, beginners may be introduced to knife attacks with slower single attacks until they have developed some skill. Then they should be introduced to more realistic attacks. The key is to make this transition from single attacks to realistic attacks as quickly as possible without overwhelming the student.
Steve