SLOC5LS6

I just had my slave cylinder and torque tube bushings replaced today. The clutch and master cylinder fluid was also bled. The car started up fine and drove normal for about 1/4 mile under normal driving conditions. Stopped at a stoplight and accelerated normally once the light went green. At around 2k rpm going into 2nd gear, the clutch pedal fell to the floor. Is it possible that air might have gotten into the hydraulics when it was bled or is it possible the master cylinder went out? My buddy is saying the clutch went out, but I disapprove his theory because the Spec 3+ wasn't slipping and held just fine at high rpms before the slave and bushings were replaced. What seems to be the issue with the clutch pedal falling on the floor???