This scene starts with a soliloquy of macbeth talking to himself, debating weather he should kill the king, “if th’assasination could trammel up the consequence and catch with his surcease, success, that but this blow might be the be-all and the end-all”  lady macbeth then enters and talks about killing the king but macbeth then replies “we will proceed no further in this business” lady macbeth is shocked and argues “what beast was’t then that made you break this enterprise to me?!”.