The inference is that the effect of having Macbeth leave the castle court at different times to carry out a task while the other character waits inside is to illustrate if they'll have a change of heart.
It should be noted that an inference simply means the conclusion that can be deduced based on the information given.
In their case, the Macbeth's wanted to kill the king. Therefore, leaving the castle at different times was to create suspense and a change of heart.
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