This is interesting. It looked kind of like an inchworm, but very skinny and sort of translucent. There was a definite head (possibly orange eyes?). It was moving forward, but in this video he started going backwards for a second. He is facing the GSP. Maybe 1.5cm in length

http://www.youtube.com/watch?v=AwrX2rR3paU

Any thoughts?

Could be a peanut worm, or maybe a "large" dorvilleid worm.

Aren't peanut worms fat? This guy was really skinny.
What is a dorvilleid? I haven't come across that worm in my research yet.

http://www.chucksaddiction.com/hitchworms.html

dam thats a lot of wormys!!

Hmm,
Still a mystery. Possibly the Sigalionidae, but not quite right. Perhaps if it grows bigger and I see it again, I might get a better idea.

Thanks for all the suggestions!
Thanks for the link!