Prone positions can be very useful- typically you have more support while prone so accuracy should be easier to attain.
The things I like about this CoF:
- Great use of various prone positions with and without cover/concealment and while the student is moving
- The student never engages from the same place twice in a row
- Moving backwards is much more realistic than walking in on any target- getting off the X always should mean putting distance between you and the threat (except for the exception where you must advance to get a loved one to safety- but this is not a typical scenario to train for)
- Search and assess- including a look behind you- is an important piece of a firing regimen. Remember that an attacker will seldom approach you head-on