Alive, in triumph! and Mercutio slain!
Away to heaven, respective lenity,
And fire-eyed fury be my conduct now!
Now, Tybalt, take the villain back again,
That late thou gavest me; for Mercutio’s soul
Is but a little way above our heads,
Staying for thine to keep him company:
Either thou, or I, or both, must go with him.

– William Shakespeare

Romeo and Juliet, Act 3, Scene 1. When Romeo sees his friend Mercutio slain by Tybalt, an impulsive Romeo allows his anger to take him over. He challenges Tybalt, determined to fight him to the death. In his rage he kills Tybalt, an impetuous act that leads to a reckless Romeo’s banishment from Verona. Romeo personifies his fury as "fire-eyed."