Romeo, in Mantua, has not received the letter from Friar Laurence telling him of the Friars plan. Instead, Balthasar arrives and tells him of Juliets apparent death (only Friar Laurence knows that shes still alive). Romeo prepares to return to Verona, stopping first to buy some poison from an apothecary.
To come on stage.
Latin, literally they leave. Everyone leaves the stage.
The character leaves the stage.