Final answer:
Hamlet compares himself to Fortinbras and is prompted to reflect on his own lack of action and resolve, leading to a significant moment of self-reflection that pushes him towards taking action.
Step-by-step explanation:
When Hamlet compares his situation to that of Fortinbras and his troop, he reflects on the active and valiant nature of Fortinbras's quest to reclaim land of little value, which stands in stark contrast to Hamlet's own hesitancy and inaction regarding avenging his father's death.
This comparison causes Hamlet to think deeply about his own circumstances, questioning his courage and determination to act upon his responsibilities and feelings of vengeance. Ultimately, the juxtaposition between Fortinbras's decisiveness and Hamlet's indecision serves as a catalyst for Hamlet's self-reflection and spurs him towards action.