Lily watched in horror as the thing, girl, once sweet thing she had half fallen into trusted at the very beginning, started morphing into something nightmarish before their eyes.
"Harry -- run," she urged, her voice hoarse.
In that moment her thoughts weren't on how to reach her friend behind the new wall, weren't on how bloody terrifying the creature before her was. The only thing she was concerned with was getting her son out.
"Impedimentia," she yelled, aiming her wand at Annie.