Board Thread:WARNING ALL USERS False Info\Spoilers/@comment-98.102.136.86-20130730030222/@comment-67.181.216.47-20130730061214

A Banshee is someone, in Irish mythology, who is like an omen of death and screaming was a way of signaling the death. So when Lydia screams, it's mainly because she found someone dead, or in the latest episode, she thought she'd die.