Explanation:
Mercutio fights Tybalt in play “Romeo and Juliet” because of a series of escalating conflicts between their two families, the Montagues and the Capulets. In Act III, Scene 1, Tybalt, Juliet’s cousin, challenges Romeo to a duel due to Romeo’s uninvited presence at the Capulet’s masked ball. However, Romeo refuses to fight as he has secretly married Juliet and now considers Tybalt as family. To defend Romeo’s honor and to demonstrate his loyalty, Mercutio takes up the challenge on Romeo’s behalf. Tragically, this decision leads to Mercutio’s own death, further fueling the spiraling consequences of the feud between the two families.