how to +/- the index in a "for all in order"
 

It would be nice to do a "wave" by a row of fairies such that the currently indexed object in a "for all in order" is at the "crest" of the "wave" while those besides to the left and right are at the ebb and start of the "wave".

Say a call to the method "standUpWave" uses index, then "sitDown" would need index-1 and "startWave" is called with index+1. Or, startWave uses index while index-1 and index-2 call on "standUpWave" and "sitDown", respectively.

How is the index in a "for all in order" accessed?

It's not accessed. You have to use the loop command and manually make the iterator yourself to access the index.

I thought so .... oh, well!