Melanie Lynskey exclusively told Us Weekly about having to bite Hilary Swank during a shocking 'Yellowjackets' scene

Swank, who landed the part two weeks before filming, talks about revealing her mystery character in the latest episode of the Showtime series (and reveals what that piece of flesh was made of.)

Would you ever think that someone would take a chunk out of your arm like that? I signed on before I even read anything.”