I think you found the sample. I've uploaded to the zone 2 MP3's from the song:
- FEAH.mp3 is the sample taken from the song. If I recall, I remember ripping the audio from the demo executable back in the day and remember hearing this very sample. I don't know if it had the background music though.
- FEAH SpeedUp.mp3 is a sped up version of the sample. I recall the demo sped up this particular sample, and it was somewhat similar to this (maybe faster, maybe slower, I don't recall).
Whether or not this sample originated from Plug's "Mind Bending", I don't know, but at least it's a clue.
Thanks for the help Simmo76!