Read the excerpt from act 4, scene 1 of The Tragedy of Macbeth. The witches have gathered around their cauldron, and they are beginning to create a potion. First Witch: Thrice the brinded cat hath mew’d. Second Witch: Thrice and once the hedge-pig whined. Third Witch: Harpier cries ’Tis time, ’tis time. Which word best describes the mood of this excerpt?