Answer:
Jack shows that Icarus had a moment of triumph even though he died in the end. He does not present Icarus as someone who failed, but someone who he experienced a triumph of his own by managing to escape, being the main witness to the beginning and the end of the triumph that he himself conquered.
Step-by-step explanation:
With the sentence presented in the question above, we can see that Gilbert has a different interpretation of the story of Icarus. We often see Icarus being portrayed as someone who failed in his escape plan, as after managing to escape the minotaur's labyrinth using wax wings, Icaus flew too close to the sun, allowing the wings to melt and he fell into the sea and died drowned.
However, Gilbert does not see Icarus as a failure, but as someone who has triumphed. He managed to escape the labyrinth, which was his main objective. The fall and death of Icarus is seen by Gilbert as the end of his most glorious moment, the moment when he sees the end of his triumph, like anyone else who has already achieved his greatest goal.