Feste greets Sebastian as Cesario, with the message for him to return to Olivia
SA also mistakes Sebastian for his twin and hits him, Seb defends himself and in the fight, SA is bettered by him adversary
Olivia enters and sees ST and Seb square up to each other, Olivia chastises ST for his behaviour and takes Seb to her house
This scene introduces Olivia to the male twin who will resolve her passionate attraction to Cesario, although exchange is brief, Sebastian is quite happy with the attention of this unknown woman
Feste's misunderstanding brings Seb and Olivia together and prompts Olivia to say harsh things about her Uncle
Shakespeare uses Viola's transvestite disguise and the identical twins to create comic possibilities in identities, situations and relationships