The different Sounds of face off
Diegetic
The glass smashing although it has been heightened I do think it sounds normal so I would say it is a diegetic sound. The guns I believe sound real they may have been heightened but they are still using fake bullets so the sounds there but the bullets are not.

Non-Diegetic
The music (somewhere over the rainbow) is a non Diegetic sound as you would not be able to hear the music from the earphones unless they were extremely loud also we can tell but the way the actors perform they cannot hear it but we can. Also the high tension upbeat music that plays is a non diegetic as non of the actors can hear it. The sounds of the bullets hitting and pinging of scenery are added on as the bullets are not real.

Sound Bridges
When the grenade is shot from the gun into the next room it is a sound bridge as it makes a sound as it travels then smashes through the glass in the next scene. Another sound bridge is when Nicholas cage Kicks the guy through the window and the glass smashing bridges to the next scene.

Parallel and contrapuntal sound
The upbeat music is fast and suits the action and makes the atmosphere tense it makes it a parallel sound. The song somewhere over the rainbow is a contrapuntal sound as it is not parallel to the scene and the action that surrounds it.