issues 92 teg 5spd

my friend got a 92 integra 5spd.. and lastnight out of the blue his clutch sank to the floor and got loose as hell.. can move it back n forth freely and when the clutch took uh shit he told me he heard something along the lines of discharge of air and fluid...but didnt see any leaking fluids. he drove the car home cause it was stuck in 1st and would turn the car off to get it to stop b4 it stalled..i took a look at the clutch cable and its fine and the lever snaps back n forth free so i really couldnt diagnose to him what i thought was wrong.. but im curious if this shit ever happened to any of you and if not what would u think is the problem.. thanks

the clutch lever shouldn't move freely. Sounds like a major clutch failure