Elrohir did not 'frolic'. He was a warrior that fought orcs and hunted them to the ends of the earth. And yet... the sight of a bird flitting by seemed to call to him until he ran along after it laughing at the twittering sounds it made. How did a bird make it into the Library? It mattered not. No, just the fun pursuit that had him following after the feathered creature.

However, he suddenly stopped as the bird climbed higher and twirled until it lighted on a rail up high. "Why do you hide from me, small one? Is something up there you wish me to see?"

Grinning, he did not realize the bird was there to see the one hiding up above.