Duncan's death brought chaos
atmosphere before death's discovery implies even nature is effected by murder
"the night has been unruly"
"strange screams of death"
"Of dire combustion and confused events"
kings body is discovered
"By th'clock 'tis day / dark night strangles the travelling lamp"
duncan's death has permenant effect on weather
disrupts natural order
"Tis unnatural"
"A falcon tow'ring in her pride of place / Was by a mousing owl hawked at and killed"
state of world has altered to mirror murder
mightily falcon killed by inferior