OK, you can see slave working by cylinder protrudes as you press the clutch. Of course your buddy has to either press the clutch to see its movement or visavera.
Slave is the actual "mechanism" to release the clutch...
BTW, when did this soft clutch pedal started?
Also, I'd clean throughly and if you can afford it buy yourself a s/s clutch line. It's only about $18-30.
And If everything cks out OK...It's high probability that your clutch may needs replacement
Ask AusT and I what a fun it is to do clutch replacement
BTW, it's always a plus if you have an extra hand or two to do the job! AND "
tranny jack"