Macbeth's reaction to Duncan's murder is to feel guilt, remorse, regret, to express his guilty conscience, to refuse to enter Duncan's chamber, to struggle to compose himself and finish the deed, to experience hallucinations, and to ultimately feign innocence through a display of emotion at the murder.
They could be scared of the end result of dismissing their work. well depending on what work that is but assuming schoolwork i’ll say they’re afraid of the bad grades and how it’ll affect their future.