The worm was wrapping itself around lampton's legs and arms as the old wise woman had said fumes from its mouth were poisonous. Every time parts of the worm got sliced up by the blades and spikes on his armor these pieces were washed away down the river washed away in the heavy current of the river. Eventually just a small section of the worm remained because the worm couldn't fit itself back together again the pieces were just washed away forever. Lampton at that point managed to get his horn and he blew three notes into his horn like that and his father who was so happy about it.