The worm battles were awesome, it was like Crab Battle all over again.
When we made the video 3 of us passed it round between deaths, trying to kill that thing.
Best i did was 1 spot left, but then i walked over the boundary in the game where it cues up the next area. When i went back to the snowfield the worm was brand new.
You can also destroy the spots if you time a melee whilst holding a heavy weapon.