Two times Fingon was there for Maedhros... and one time he wasn't.
Here
Craning his neck upwards against the craggy ascent of the cliff, he saw flame-red hair spilling from a limp figure chained to the rock, blooming like a deadly flower on the cliff-side, and his heart wrenched within him as he shouted to the stone-dead sky, Maitimo, I am here!
Sheets twisted and writhed in the clutch of a lone left hand seeking, seeking its mate in vain as its master slept fitfully, dreaming of iron and fire and torment, pallid lips parting in silent supplication while a second voice floated through his dreams like a refrain: All through the darkness, Nelyo, I'll always be here.
Blood pooled in lurid blooms on the ground; flames leapt from the embattled ranks as he charged toward the fire-demon, and all through that fatal clash of blue and silver against flame and darkness he whispered I am here until the dark axe of Gothmog struck him down - I was here, Maitimo, and it was not enough.