Their father, Elrond Peredhil, had given Elladan strict orders not to lay an attack for his returning son, but he had forgotten to include Elrohir in that order. Tonight their brother was going to come home after a long absence. Elladan didn't know where his twin was, but he guessed that he was probably laying and ambush somewhere in the woods that surrounded the hidden valley of Rivendell.
Elladan leaned against the railing of the balcony that was outside his and his twins chambers, but right now Elrohir wasn't there with his brother.