Final answer:
In the story 'When Death Came to Flannan Isle', one example of foreshadowing is the crow cawing three times before the assassins enter the room.
Step-by-step explanation:
An example of foreshadowing in the story 'When Death Came to Flannan Isle' is when the protagonist hears a crow caw three times and fly away. This event foreshadows something ill or dangerous about to happen to the protagonist. Later on, assassins enter the protagonist's room, but the protagonist is not there. The foreshadowing of the crow's cawing hints at the impending danger that the protagonist manages to avoid.