What hides between Shadow and Light?

[Bloody_Eugene]

I've altredy posted this in another thread, but I'll copy&paste here because this thread is more specific:

I decoded the first part and it is just an anagram:

"These hole digging critters have a population that increase rapidly. There must be a way to track this development and make the infestation come to an end."

Then I organized the first row numbers this way:
3, 9, 7,
4, 8, 9,
5, 7, 11,
6, 6, 13,
7,

Read them in column: the first is the preceding +1; the second is the preceding -1; the second is the preceding +2.
Is this the series we have to put an end to?

Not sure about the remaining lines.

What do you think?