To answer your question on what a Snark is, it's those little bastards from Half Life that act a bit like Infection Forms. They run and jump around while making an annoying sound until either they die from their Time Limit ending or they hit something and explode.
This was so fun to record! Also fitting you post this video today because it just so happens to be the day Halo CE is now old enough to drink! Happy 21st Birthday Halo!