Weird Sound Glitch in Red Faction II

I was getting footage for a new youtube channel I'm starting soon (details in an update video coming tomorrow-ish) when I encountered an odd glitch in the game I was playing (The PS3/PS2 Classics version of Red Faction II). All of the audio (sound effects, dialogue, music, etc.) disappeared and all I was left with were the gun noises, explosions, and BLEH. Every guard started shouting "bleh" at me. It was bizarre.