1. Cinna is glad because she has just seen Cassius whom she believes can help to overthrow Caesar.
2. Earlier in the scene, the person describing strange nights is Cassius who believes that he has seen strange sights.
3. Cassius asked the question because he was anxious to begin the conspiracy to kill Caesar.
4. Sinha was eager for Brutus to join them in the conspiracy because he believed that he was a nobleman whose support would be invaluable.
What was the instruction?
Sinha was so eager for Brutus to join the conspiracy that he told him to throw some papers to him and affix some on his statues. The reason was that the papers contained pieces of information that would make Brutus join them in their conspiracy.
So, the entire tale is centered on the plan by the trusted friends of Julius Caesar, to eliminate him. Only Brutus stood his ground and refused to join
.