Mercy, Love by Elleth

Chapter 8

They hack a captive to pieces before Barad Eithel as though they know that Fingon is watching, as though they want to kindle his wrath rather than his pity for one less suffering spirit in the world. But they kindle another's wrath - the man's brother who is the one to rush out to start the war that - he does not know yet, being filled with hope still - will come to be called the Unnumbered Tears.

Fingon's first tears fall when the gates of Angband slam in his face and the same Gwindor is now captive. They don't fall for his fallen.