Board Thread:General Discussion/@comment-6192846-20150214203742/@comment-6192846-20150217193659

I agree with the above. I took it to mean the line was intended to echo H&G's lines. Here's a side by side comparison:

CS

聞こえてくるのは鳥の歌？ (Do you/I hear the song of the birds coming?)

いいえそれは森の鳴き声 (No, it is the cries of the forest)

SCP

聞こえてくるのは森の歌？ (Do you hear the song of the forest coming?)

いいえそれは破滅の銃声 (No, it is my gunshot of destruction)

The only difference in the first line is the replacement of bird with forest and the second one just had its last phrase changed to "gunshot of destruction" rather than the cries [literally animal sounds] of the forest.

There's clearly an allusion there and I got the same impression that it was to subtly tie Nemesis' influence by the alleged voices of H&G she hears.