In this scene:
* Hamlet is disguised as a madman and is on his way to England with Rosencrantz and Guildenstern.
* Fortinbras appears in the scene with his army, marching through Denmark on their way to reclaim land from Poland.
Hamlet and Fortinbras are in the same location but do not interact. The scene is significant because it provides a stark contrast between the two characters:
* Hamlet is internally conflicted and paralyzed by inaction.
* Fortinbras is decisive and willing to take action to achieve his goals.
While the scene highlights the contrast, the two characters don't actually cross paths.