Rebecca allows Billy to escape , believing his claims that he is innocent and telling the authorities that he subsequently perished in the Arklay Mountains after their encounter .
In the final battle sequence , Billy and Rebecca destroy the Queen Leech by exploiting its vulnerability to sunlight .
Rebecca allows Billy to escape , believing Billy 's claims that he is innocent and telling the authorities that he subsequently perished in the Arklay Mountains after their encounter .
In the final battle sequence , Billy and Rebecca destroy the Queen Leech by exploiting its vulnerability to sunlight .