Where is the allusin in act 3 of Romeo and Juliet?

In Act 3, Scene 2 of Romeo and Juliet, when the nurse tells Juliet about the argument between Romeo and Tybalt, she makes an allusion to the story of Pyramus and Thisbe. In this story, Pyramus and Thisbe were two lovers who were forbidden from being together by their parents. They decided to meet in secret, but Thisbe was scared by a lion and had to flee. She left behind her cloak, which was covered in blood, and Pyramus, thinking that she had been killed, committed suicide. When Thisbe returned, she found Pyramus dead and killed herself as well. The nurse alludes to this story when she says, "Tybalt, the prince of cats, who but now killed Montague, the prince of mice." She is comparing Romeo to Pyramus and Tybalt to the lion, and suggesting that Romeo will be killed by Tybalt.