Jack was woken up by sirens from firetrucks in the street. He raced to his window to see was happening. He saw his beloved Grandpa was on top of the building next to theirs. Grandpa had been doing this for eight months now, which had been scaring Jack, because lately his mind had somehow gone back to years ago when he was in World War Two. So to Grandpa, he thought he was in his speedy Hurricane, that is the plane that he flew back then in World War Two, between 1939-1945.
Suddenly, as Jack watched, Grandpa started leaping from building to building. Jack came out to help his Grandpa get his mind back. Everyone was running after Grandpa, so he glanced over to see what was happening and saw Jack. When he saw Jack, he got his mind back and then Jack took him home.