In William Shakespeare's Romeo and Juliet, Tybalt reacts with intense anger and hostility upon seeing Romeo at the Capulet party. He recognizes Romeo's voice and immediately expresses his outrage, calling for his sword and wanting to confront him. Tybalt's reaction is driven by his fierce loyalty to the Capulet family and his deep-seated hatred for the Montagues, indicating he is hot-headed and quick to violence.
Tybalt's eagerness to fight also illustrates his rashness and inability to control his emotions. He prioritizes family honor over reason, demonstrating that he is driven by a sense of pride and a desire for revenge. When he informs Lord Capulet of Romeo's presence, he expects his uncle to support his aggression, but Capulet instead tries to maintain the peace, showing a contrast between Tybalt's impulsive nature and Capulet's more measured approach.
Overall, Tybalt's reaction reveals him to be a passionate, aggressive character who embodies the feud between the Montagues and Capulets and sets the stage for the tragic conflicts that follow in the play.