[PU4, Powers] What does Cosmic power modifier actually do?

[Gurps Fan]

Originally Posted by the_matrix_walker

I think "any power, regardless of source" means "any source Neutralize could be otherwise purchased to work on" as Neutralize normally only works on ONE source.

Indeed, the rules say that when Cosmic ability and Cosmic countermeasure collides, both sides are supposed to be treated as lacking Cosmic. From this, however, does it follow that the Cosmic power is "then treated as wild"?

I don't think so. Cosmic countermeasure doesn't change the fact that the targeted power is not a set of some "wild" ("raw") advantages but it belongs to a specific power source ("energy of creation" in this case). I interpret "treat as if neither side were not Cosmic" as simply meaning that the immune-to-any-mundane-countermeasure part of the targeted Cosmic power is ignored. Borrowing the expression of PU4, depriving the subject of all the abilities that belong to one specific source is "how Neutralize works, not a Cosmic effect".