Ok,real quick,8 point is a total blocking system developed by Bruce Lee,and Ed Parker,its just a matter of adapting it,and the counter strikes to boxing.
The arrow drill is a substitute for the slip line
On a slip line or a double end bag,you can time things,but if Im controling it via the arrow Im wapping you with,you have to slip on the fly,rather then just a rythmic motion.
Basically I stand in front of a fighter,and tap which part I want them to slip with,shoulders,head,etc
Be able to do it when it isnt expected