Question

how did Decius interpret Calpurnia's dream

Answer 1

Decius enters, saying that he has come to bring Caesar to the Senate. He adds that Calpurnia has had a dream in which she saw his statue run with blood like a fountain, while many smiling Romans bathed their hands in the blood; she has taken this to portend danger for Caesar.

Answer 2

Decius enters, saying that he has come to bring Caesar to the Senate. ... He adds that Calpurnia has had a dream in which she saw his statue run with blood like a fountain, while many smiling Romans bathed their hands in the blood; she has taken this to portend danger for Caesar.
____Hope helped!