Legolas has never had to deal with loss in his Mirkwood home. He grieved deeply when Gandalf died, but it all came rushing back when he learned of Boromir's fall. This is his feelings/thoughts near the end of the Fellowship of the Rings, when Boromir falls.

'Boromir is dead'

Aragorn said

And Legolas felt

A loss

A feeling he's never

Felt in his life

In his sheltered world

Of Mirkwood

He glances to the other two,

Aragorn and Gimli,

Tears roll down their dirt smudged faces

Shamelessly to the ground

He reaches up at the feeling of warmth

The touch of wet upon his face

He brings his fingers away in amazement

They are covered with Silver Elven Tears