Hi José,
Think of a big bag. If you push this bag in the middle, it will just move (roughly). If it has a handle on the side and you pull on that handle, tangentially, it might rotate/revolve more around its own axis first, than moving just straight.
In other words, the Point Index allows you to specify for a none-clone object where a “power” would attack.
To illustrate that in a better way, please have a look at the file below. Go to the Take System and let it play with take 123 and then with 369 [point numbers]. The outcome is quite different.
Scene file
https://www.amazon.com/clouddrive/share/kQ6efdAaQjJ2nHzK5B5nQXGcpxbujNCImh4CeFFGCZo
All the best
P.S.: based on your file:
https://www.amazon.com/clouddrive/share/bMCWs7BHRYiVH2JZoe08sN9d0iqRrgvQasEDr8HPVV0
I use the subtract instead of Add -1 for a better reading of the script.
Please use the Take System.
The X-Manager should be sorted for a cleaner reading as well. Top is first , bottom is last in the execution. This might help to prevent delays.