In the most basic terms, Macbeth reacts with shock at Duncan's announcement of Malcolm as heir. The Scottish system of ascendancy to the throne was different from England's system of primogeniture (first born son takes the throne). All this eluded Macbeth. He was only shocked and apparently enraged by Duncan's words.
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"That is a step On which I must fall down, or else o'erlesp, for in my way it lies"
Doing this in school, hope it helps!
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