In this movie scene from Leon - The Professional, Natalie Portman has just lost her entire family to the bad guys, and she just walked past them and is looking for a place to hide. That place is of course at Leon's apartment.

  These next two scenes are when Mathilda is first living with Leon and eventually he becomes her hitman tutor. She also goes through a myriad of emotions along the way.

  Here Mathilda is learning the ins and outs of shooting someone in a park.

  In this scene, Matilda is out looking for the bad guys.

  This is near the end of the movie where the bad guys have attacked with all their resources while Leon defends them against their attackers and Matilda is freaking out in the corner behind an overturned table.