Metaphor for the battle currently raging.
Paradox shows that every victory has a cost, and no one wins without someone else losing - foreshadows Macbeth’s future: his rise to power will come through loss, betrayal, and death.
Enjambment - The sentence runs across two lines without a pause, creating a flowing, spell-like rhythm.
Trochaic tetrameter: a rhythm often used by witches in Shakespeare’s plays.
The chant-like rhythm creates a spellbinding, eerie tone, making the witches feel otherworldly.
Contrasts with iambic pentameter, which most noble characters speak in - separating the witches from other characters.