Saw 2 is an american horror film from 2005, directed by Darren lynn bousman.

The first thing we see in he film was a POV shot. This is used to show what the characters we are viewing are seeing from their eyes. This is used to show what is happening as more horrific for the viewer, as we can see what it would be like.

Next we see a shot reverse shot between jigsaw, and the person. Shot reverse shots were used to have a conversation between two characters, and possibly show relationship. However in this scene we can see the relationship between them is captor and victim, with the volatile face on the victims face. The shit reverse shot is used until the conversation is over.

This is called Continuity editing, and its made to show the story seamlessly from different  angles.