Benvolio is a Montague and Romeo’s cousin. In this line, he attempts to stop the fight. He does, however, draw his sword.
Benvolio looks a bit like the word benevolent ( as it starts with the same letters). Benevolent means all loving, this suggests that Benvolio will be the peacemaker and end the fights ratherthan start them. This is contradicted by Tybalt who starts the fights and laughs at Benvolio’s peace.