What event does the opening passage of act 3 hint at or foreshadow in romeo and Juliet?

The opening passage of Act 3 hints at or foreshadows the tragic death of Mercutio. Tybalt, a member of the Capulet family, enters and challenges Romeo to a fight, as he is angry that Romeo has crashed the Capulet ball. Romeo refuses to fight, but Mercutio steps in to defend him. Unfortunately, Romeo is caught between Mercutio and Tybalt while trying to prevent the fight, and Tybalt stabs Mercutio under Romeo's arm, mortally wounding him. Mercutio's death sets in motion a chain of events that ultimately lead to the tragic ending of the play.